Used Ipg Laser Source for sale (3,487)

Year of construction: 2021, condition: new, Fiber delivery cable with instalation ( splicing )on your IPG, Maxphotonic , Raycus, GW.... laser source. Lredpfsg D Urgex Akqsk We are doing reparation IPG laser module in your place with warranty. Speaking English and Serbian language.

Year of construction: 2013, condition: ready for operation (used), An IPG laser source with peripheral equipment is available. 1) IPG Laser YLS-3000-CT, year of manufacture: 2013, wavelength: 1070nm, modulation: 0kHz-5kHz, power control range: 10%-100%, power stability: +/-1%. Machine dimensions X/Y/Z: approx. 800mm/800mm/560mm, weight: approx. 400kg. 2) Industrial chiller IPG Laser LC 170.01-A.3.5, year of manufacture: 2013, cooling capacity: 17kW, max. operating pressure: 28bar, refrigerant: R407C, refrigerant quantity: 3.5kg. 3) Wire feeder Dinse DIX WD 300, feed rate: 20m/min, wire diameter range: 0.8mm-1.6mm, machine dimensions X/Y/Z: approx. 300mm/250mm/250mm. 4) Laser process head. Documentation available. On-site inspection is possible. Lrjdex H S Nwepfx Akqjk

Condition: good (used), Year of construction: 2011, machine/vehicle number: 11095150, IPG Laser GmbH used 4kW laser source with cooling unit 400-460V AC 3P/PE 50/60 Hz 30.8A year of construction 2011 DWG number: G25-16-100920-2 Cooling unit: LC170.01-W3.5 Year of construction 2010 3/PE - 400V Ljdpfjrq D D Ejx Akqjrk 50Hz 21,8A 4pcs available

Condition: new, Year of construction: 2025, If you are looking for the right machine and not a toy, then you have come to the right place: Foil label - label printer - name plate machine Laser markers skyLASER Mark 500 - 2D fiber laser engraving / marking laser is the complete solution for your complex laser engraving applications (* Prices depending on the equipment, this is a brand new laser machine from our production) Our skyLaser Mark systems are used exactly where the conventional CO2 laser technology has its limits. Using the fiber laser with a wavelength of 1064nm, even the most filigree structures can be realized in almost any material. In contrast to conventional milling processes, the laser works without contact, without force and without tool wear. The advantages in your application are the geometric flexibility and high machining accuracy. This type of machining can be used regardless of the hardness of the workpiece to be machined. The flexibility of the system increases with the mobile work table, which can be adapted to your needs. You can easily integrate the system into your production line, or operate it as a stand-alone solution. Our skyLaser Marks deliver very precise and permanent markings (laser engravings) and are suitable for the special area of ​​laser metal and certain organic substances. The use of a variety of fonts, the application of barcodes, serial numbers, logos and pictures is easily possible. Thanks to the excellent resolution, almost all requirements for marking tasks can be solved. Production of embossing stamps, engravings, inscriptions and complex, fine structures, the software is extremely user-friendly. Even very complex and complex marking tasks can be easily created on the supplied industrial PC. Precise positioning is done in no time at all, thanks to the optional observation camera for process tracking and software-based workpiece alignment. Lodpfscuiz Tex Akqork Since the system has hardly any wearing parts and is almost maintenance-free thanks to the IPG laser technology, it can be used especially for industrial applications as well as in continuous use. The skylaser marking laser / engraving laser at a glance: Processing area: from 110 x 110 or 120x120 or 300x300 mm (F-theta lenses dependent / 3D option) Laser source: IPG (pulsed fiber laser, YTTERBIUM PULSED FIBER LASER) SCANLAB galvanometer scanner Nominal laser power: 20W New: software-controlled, variably adjustable working width (X, axis max. 450mm depending on structure) New: software-controlled, variably adjustable working height (Z, axis max. 200/450 mm depending on the body) Optional other work areas - automatic material feed, etc. Air cooling due to low energy consumption Labeling speed: up to 8000 mm / s (SCANLAB dyn AXIS ® galvanometer scanners the SCAN cube ® 10 achieve labeling speeds of up to 640 characters per second.) Redundant security system Laser class: 1 or, depending on the configuration, laser class: 2 (through optional pilot laser) pfeifer-technology HQ mirrors and optics for perfect results, powerd by Scanlab (R) pfeifer-technology industrial PC including pre-installed control software New: incl. Laser Focus Finder New: incl. Process air control New: including suction control Optional: positioning laser: integrated diode laser for optimal positioning New including F-Theta lens 110 x 110 mm working area with protective glass! (Extension of the work area optionally to (180, 350 mm) almost maintenance-free

Condition: new, Year of construction: 2025, If you are looking for the right machine and not a toy, then you have come to the right place: Foil label - label printer - name plate machine Laser markers skyLASER Mark 500 - 2D fiber laser engraving / marking laser is the complete solution for your complex laser engraving applications (* Prices depending on the equipment, this is a brand new laser machine from our production) Our skyLaser Mark systems are used exactly where the conventional CO2 laser technology has its limits. Using the fiber laser with a wavelength of 1064nm, even the most filigree structures can be realized in almost any material. In contrast to conventional milling processes, the laser works without contact, without force and without tool wear. The advantages in your application are the geometric flexibility and high machining accuracy. This type of machining can be used regardless of the hardness of the workpiece to be machined. The flexibility of the system increases with the mobile work table, which can be adapted to your needs. You can easily integrate the system into your production line, or operate it as a stand-alone solution. Our skyLaser Marks deliver very precise and permanent markings (laser engravings) and are suitable for the special area of ​​laser metal and certain organic substances. The use of a variety of fonts, the application of barcodes, serial numbers, logos and pictures is easily possible. Thanks to the excellent resolution, almost all requirements for marking tasks can be solved. Production of embossing stamps, engravings, inscriptions and complex, fine structures, the software is extremely user-friendly. Even very complex and complex marking tasks can be easily created on the supplied industrial PC. Precise positioning is done in no time at all, thanks to the optional observation camera for process tracking and software-based workpiece alignment. Since the system has hardly any wearing parts and is almost maintenance-free thanks to the IPG laser technology, it can be used especially for industrial applications as well as in continuous use. The skylaser marking laser / engraving laser at a glance: Lodpocuiz Sjfx Akqerk Processing area: from 110 x 110 or 120x120 or 300x300 mm (F-theta lenses dependent / 3D option) Laser source: IPG (pulsed fiber laser, YTTERBIUM PULSED FIBER LASER) SCANLAB galvanometer scanner Nominal laser power: 20W New: software-controlled, variably adjustable working width (X, axis max. 450mm depending on structure) New: software-controlled, variably adjustable working height (Z, axis max. 200/450 mm depending on the body) Optional other work areas - automatic material feed, etc. Air cooling due to low energy consumption Labeling speed: up to 8000 mm / s (SCANLAB dyn AXIS ® galvanometer scanners the SCAN cube ® 10 achieve labeling speeds of up to 640 characters per second.) Redundant security system Laser class: 1 or, depending on the configuration, laser class: 2 (through optional pilot laser) pfeifer-technology HQ mirrors and optics for perfect results, powerd by Scanlab (R) pfeifer-technology industrial PC including pre-installed control software New: incl. Laser Focus Finder New: incl. Process air control New: including suction control

Condition: used, functionality: fully functional, Year of construction: 2018, machine/vehicle number: 18089754, laser type: fiber laser, Description: High-performance fiber laser from IPG Laser GmbH, manufactured in Germany. The laser is designed for industrial applications such as cutting, welding, or surface processing and is distinguished by high efficiency, stable beam quality, and robust construction. Ljdpfx Akoxv Dp Ssqjrk Technical data: Manufacturer: IPG Laser GmbH, Burbach, Germany Model: YLS-4000-S2T Serial number: 18089754 Year of manufacture: September 2018 Rated voltage: 400–460 V AC, 3 phases + PE Frequency: 50 / 60 Hz Full load current: 29.3 A Circuit protection: 32 A / 120 kA CE marking: present

Condition: like new (used), Year of construction: 2018, Laser Welding Robotic system for welding steel, stainless steel. Scope of supply: Ljdpfx Aoh Ad E Uskqjrk 1 x YASKAWA 6-axis robot YASKAWA HP20RD.(Payload: 20kg, H-Reach: 2017mm, Robot Mass: 293kg, 2010.04) 1 x YASKAWA DX100 controller.(2010.05). 1 x IPG YLS-4000.(2017). 1 x IPG CHILLER.(2017). 1 x HIGHYAG BIMO LASER WELDING HEAD(S.N.:BIMO2W17013). Machine can be inspected. Very good condition. Connected, can be tested. Shipping to EU countries is our responsibility and the shipping cost is free.

Condition: used, functionality: fully functional, Year of construction: 2020, We provide laser REPAIR services for all kind of IPG lasers. We replace broken laser modules with referbished fully functional ones, do all adjustments and make your fiber laser up and running! No matter what the problem is with your IPG Laser Source, we bring it back to life. Not only IPG sources, we repair Max Photonics, Raycus and other laser sources with our more than 10 years of experience in fiber laser industry. Ledpewf Hxqsfx Akqerk

Year of construction: 2019, condition: like new (used), functionality: fully functional, Laser Welding Robotic system for welding steel, stainless steel. Scope of supply: 1 x YASKAWA 6-axis robot YASKAWA MH6.(Payload: 6kg, H-Reach:1422mm, Robot Mass: 130kg, 2009.03) 1 x YASKAWA DX100 controller.( 2009.03 ) 1 x IPG YLS-1000 Ytterbium 1kW Laser.(2011.05) 1 x IPG P30 laser welding head with coaxial nozzle and cam.(2018.05) 1 x Cooling water circulation system RIEDEL for laser.(2011) 1 x Cooling water circulation system Chilly-35-S for optics.(2010). 1 x siegmund table 1200x800.(2019) 1 x IPG Welding Head Alarm Module Box WHAM.(2018.05) 1 x PC for Laser with LaserNet software. Machine can be inspected. Very good condition. Connected, can be tested. Lodpfx Akoh Ad E Hjqerk Shipping to EU countries is our responsibility and the shipping cost is free.

Year of construction: 2017, condition: like new (used), Set for robotic laser welding Scope of supply: 1 x IPG YLS-4000 4KW output laser (2017). Fiber core 300 microns and 30 meter length, LCA LCA. Optical coupler inside. Profinet interface. Power ON work time : 32832 hours 1 x IPG CHILLER.(2017). Lrsdpferfucqox Akqek 1 x HIGHYAG BIMO LASER WELDING HEAD with air knife. Machine can be inspected. Very good condition. Connected, can be tested. Shipping to EU countries is our responsibility and the shipping cost is free.

Condition: ready for operation (used), functionality: fully functional, Year of construction: 2021, operating hours: 7,000 h, laser power: 6,000 W, laser wavelength: 1,080 nm, warranty duration: 24 months, IPG Photonics YLS6000U – 6 kW Laser Source Condition: Fully functional, tested Warranty: 24 months operational warranty Services offered: Repair and maintenance of IPG laser sources Replacement and repair of laser modules, beam combiners, and optical cables On-site service at client’s facilities, anywhere in the world Advantages: High-quality IPG Photonics laser source, 6 kW power Ledjyy Rp Njpfx Akqsrk Reliable performance with full warranty Global service availability For all further information, please feel free to contact us.

Condition: ready for operation (used), Year of construction: 2012, Laser power: 4000W (4kW), wavelength: 1030nm, beam quality (BPP): 8mm/mrad, beam diameter setting: 0.1µm, machine dimensions X/Y/Z: approx. 1000mm/1600mm/1600mm, weight: approx. 1000kg. Including 2x scanner optics (PFO) for the process cells, 3x fiber optic cables and spare parts. Documentation available. On-site inspection is possible. Ledpfswwll Hjx Akqork

Condition: good (used), Here we offer a laser beam source from Coherent with PC. Ledpfjdmzhqsx Akqsrk Name: AVIA 355-X Operating hours: Diodes 1975/1975, Head 26488 Wavelength: 355nm Excitation: diode pumped Laser type: Nd:YAG laser Laser type 2: THG, Q-switch Operating mode: pulsed Laser power: 10 W at 60 kHz Beam divergence:

Condition: excellent (used), Here we offer a laser beam source from Coherent. Lredpfx Aoihp Arjkqok Designation: AVIA 355-X Operating hours: Diodes 43022/43022, Head 42955 Crystal Shifter: 1845.91 hours Wavelength: 355nm Excitation: diode pumped Laser type: Nd:YAG laser Laser type 2: THG, Q-Switch Operating mode: pulsed Laser power: 10 W at 60 kHz Beam divergence :

Condition: used, Trumpf Type: TruDisk 4002 / W20.HL29 Trumpf TruDisk 4002 laser beam source with KLH cooler The Trumpf TruDisk 4002 laser beam source is an industrial disk laser source (disk laser) from TRUMPF, characterized by high power, beam quality, and efficiency. It is frequently used for welding, cutting, and other material processing applications. Maintenance has been performed regularly. Unit consisting of a beam source with associated cooler, but without optics and fiber optic cable. Technical Specifications Laser power: 4,000 watts (4 kW) (minimum 80 W) Wavelength: ~1030 nm (infrared range) (Yb:YAG) Beam quality (BPP): typically ≤ 8 mm mrad Fiber connection: TruDisk lasers usually have multiple fiber connections Cooling: Water-cooled – via a KLH cooler Dimensions: 1.0 x 2.0 x H1.6 m (laser) + 1.0 x 1.5 x 1.8 m (cooler) 380 V -10% ... 460 V +10%, 3AC + PE 23 kW / 25 kV A - 34 A / 400 V 50 ... 60 Hz KLH cooler: Lrsdpswh Rnzsfx Akqjk The KLH cooler is an industrial liquid cooler that ensures heat dissipation from high-performance laser systems such as the TruDisk 4002. Typical Features: Water-to-water cooling Precise temperature control (typically 20–25°C) Refrigerant: R 404A Can be controlled via TRUMPF interface Required to comply with laser specifications Device Type W20.HL29 Weight: 850 kg (laser) + estimated 550 kg (cooler) Condition: Used Scope of delivery: (See image) (Subject to change and errors in the technical specifications, information is subject to change!) We are happy to answer any further questions over the phone.

Year of construction: 2000, condition: ready for operation (used), Operational hours counter heating: 23,002h, with controls cabinet and documentation. Ljdpfx Ajnl Emmskqerk

Year of construction: 2025, condition: new, machine/vehicle number: AB2024, Pclass = working area X 1250mm x Y 1250mm x Z 25mm Lsdpfxjdvik Ns Akqjrk skyCUBE P laser processing center - the new Pclass, more productive with a larger work surface than laser cutting machine for your metals Laser processing simple and high-precision - laser engraving, cutting at high speed and quality

Condition: good (used), Trumpf TruMicro 6 kW Laser Source High-performance disk laser with nanosecond pulses. The high-performance nanosecond lasers of the TruMicro Series 7000 are based on disk laser technology and combine short pulses and high pulse energies, even at high frequencies. This allows you to remove layers and contaminants at maximum speed and reduce your cycle times. Further optimize your processes by varying the repetition rate – while maintaining a constant pulse duration. The short-pulse lasers of the TruMicro Series 7000 are the ideal tool for the efficient and economical cleaning of tire molds. Large-area applications with high average power Ablation, cleaning, annealing: The lasers of the TruMicro Series 7000 demonstrate their full potential in large-area applications. With pulse energies of up to 100 mJ, they achieve enormous layer removal rates. A scanner ensures excellent power utilization. Flexible laser light cables transport the light to its intended destination and facilitate laser integration. Manufacturer: Trumpf Type: TruMicro 7050 Laser Source Power: 6 kW Cooling: Water System Input Power: 380–460 VAC, 3-phase Lrodpfx Aexaktlekqsk Laser Power: 750 W Wavelength: 1030 nm Pulse Energy: 80 mJ Pulse Duration: 30 ns Beam Quality: 20 mm Repetition Rate: 5 to 100 kHz Fiber Diameter: 400 µm IP Rating: 54 Dimensions (W x H x D): 1460 mm x 1350 mm x 730 mm Financing through our bank is also possible. komplett-konzept.leasingo.de Find more items – new and used – in our shop! International shipping costs available upon request!

Year of construction: 2020, condition: used, IPG, MaxPhotonics, Raycus fiber laser source and module REPARATION. We are doing service and reparation laser cutting machines ,3D laser metal printers , laser welding units, and laser sources in your factory. Trumpf, Bystronic, LVD , Concept , etc.... Upgrading Trumpf Co2 laser cutting machines with FIBER sources.We dismantle cnc laser machines and install them all over Europe. Lsdpfeg Ekquex Akqsrk We are installing new cnc laser machines.

Condition: new, Year of construction: 2024, Flatbed laser HD-F 3015 15 kW laser cutting system . Technical details: - Max. Sheet metal size: 12,000 mm x 2,000 mm Max. Lrodpogyfm Eefx Akqsk - Max. sheet weight: 235 kg/m² -Laser power (IPG): 15 kW -travel Z - axis: 125 mm -Max. Synchronous speed (X-Y): 141 m/min. -Max. Acceleration (X-Y): 10 m/s² - Positioning accuracy: ±0.05 mm - Repeat accuracy: ±0.05 mm Cutting range: - steel: 40 mm - Stainless steel: 30 mm - Aluminium (AlMg3): 30 mm Equipment: IPG 15000W Fiber Laser Source (Cooler included) Compact dust extraction (filter) Air conditioner in control cabinet Flatbed laser with automatic shuttle table Laser cut monitoring Automatic laser head positioning CE - shuttle table with light barrier protection Control SIEMENS SINUMERIK 840D Auto focusing Precitec Procutter cutting head F150 focus Flatbed laser with shuttle table (automatic pallet changing system) Pipe cutting device lateral max. Ø400 mm Sheet metal inspection (Autom. sheet metal position and sizes measuring system) Positioning laser diode Automatic nozzle cleaning Central lubrication system Motorized chip conveyor Simple user interface parameter page (power-speed-pressure) Lantek or Metalix Cad/Cam software with Autonesting Lighting for the working area Multi-chamber suction system Warning light Special laser cutting options Positioning laser diode Pierceline (piercing settings) Focusline Plasmaline Fastline Flyline Training support for Cad/Cam programming Application training Remote maintenance

Condition: used, Year of construction: 2018, 3D printer Laser Type / Power: Yb Fibre Laser / 250 W Wavelength: 1070 nm Lens: Precision F-Theta Lens Building Volume: Ø 100 mm x 100 mm Reservoir Volume: Ø 110 mm x 200 mm Coater: Rotation led precision coater Lrjdpfx Asvtftqokqjk Gas Connection: Argon/Nitrogen Layer Thickness: 20 – 100 μm Scan Speed: Jog 20 m/s, Operation 6 m/s Spot Size: min. 40 μm Machine Opening: 450 x 180 mm

Condition: used, Year of construction: 2017, ABB robot cell with Clean Laser Manufacturer: ABB / Clean Laser Type: IRB4600 Year of manufacture: 2017 Lodpfx Akowrcn Ujqjrk System consists of: ABB robot IRB4600 Control cabinet Handheld control device Laser cleaning unit Clean Laser type intelliScan30 Extraction system TEKA 16426ä

Condition: new, functionality: fully functional, Year of construction: 2026, control type: CNC control, degree of automation: automatic, actuation type: electric, laser type: fiber laser, laser source manufacturer: MAX Photonics, laser power: 1,500 W, sheet thickness steel (max.): 15 mm, sheet thickness stainless steel (max.): 6 mm, sheet thickness aluminum (max.): 6 mm, sheet thickness brass (max.): 4 mm, input frequency: 50 Hz, type of input current: three-phase, type of cooling: water, compressed air connection: 8 bar, overall weight: 2,800 kg, Equipment: CE marking, centralized greasing system, cooling unit, dust extraction, emergency stop, fume extraction, safety light barrier, Laser Cutting Machine with 1500 W Fiber Laser "Ecoline" Our goal is to offer highly precise, long-term stable, yet affordable laser machines. Our machines are ideal for workshops and repair businesses. A perfectly developed library of cutting parameters is included, along with first-class service. Please also take note of our attractive leasing and hire-purchase options. Lrodpfx Aksitu Srsqek The most cost-effective entry into laser cutting technology - High-quality MaxPhotonics laser source - Extremely energy-efficient cutting system - Requires only approx. 3.0 x 3.0 meters installation space - Top quality; book your viewing appointment now! Cutting capacities: - Steel sheet up to 15 mm - Stainless steel up to 6 mm - Aluminum sheet up to 5 mm - Travel range approx. 1300 x 1300 mm - Table size approx. 1300 x 2500 mm (suitable for a full mid-format sheet) - Machine control in German - Manual front door - Comprehensive collision protection features - Large front window for monitoring the cutting process - Automatic, programmable 2-gas switching (compressed air/nitrogen, oxygen) - Extensive cutting parameter files - Includes nesting module - CypCut1000 cutting software - Raytools 240 cutting head - Very user-friendly operation - High-performance laser chiller Sales are exclusively to commercial customers. Delivery/Consultation/Sales only in Germany, Austria, and Switzerland. Machine dimensions approx.: Width: 3.2 m Height: 2.3 m Length: 3.3 m Total weight: approx. 2800 kg Need a different laser power, table shape, or table size? No problem. I am happy to provide a custom quote. Not sure which laser power is right for your application? Of course, I can carry out cutting tests tailored to your requirements. Many options are available—from 0.5 kW up to 20 kW laser power.

Condition: as good as new (ex-display), Year of construction: 2024, operating hours: 10 h, functionality: fully functional, shaft length: 1,070 mm, input voltage: 230 V, type of input current: AC, laser power: 30 W, type of cooling: air, warranty duration: 12 months, laser wavelength: 1,070 nm, Equipment: cabin, Laser engraving machine with 30 watt laser power - Demonstration unit (approx. 100 hours) - Viewing is worthwhile - Includes Windows PC 64bit (with monitor/keyboard/mouse) - Fully installed and calibrated - Engraving software in German - Very easy to operate - Switch on and start immediately - 30 watt fiber laser source for high-contrast and fast markings with extremely high resolution (see images) - Wobble function, e.g. for cleaning metal components - Deep engraving up to 3mm possible - For engraving a wide range of metals (stainless steel, brass, aluminum, etc.) and many plastics - Heavy-duty industrial quality - Complete system / ready for immediate use - Working area approx. 390 x 270 x 350 mm (L x W x H) - Clamping surface with threaded holes in a 50 mm grid - LED workspace lighting - 50 mm pipe connection for fume extraction - Engraving area up to 170 x 170 mm - Motorized focus adjustment - Foot switch included for starting the engraving process Lredjd Ha I Sopfx Akqok Please also check our attractive leasing and hire purchase offers. Sale exclusively to commercial customers. Delivery / consulting / sales only in Germany / Austria / Switzerland Machine dimensions approx.: Width: 450 mm Height: 800 mm Depth: 750 mm Weight: approx. 80 kg

Condition: as good as new (ex-display), functionality: fully functional, Year of construction: 2025, laser power: 150 W, input voltage: 230 V, type of cooling: water, warranty duration: 12 months, shaft length: 10,700 mm, Equipment: CE marking, cabin, cooling unit, documentation/manual, dust extraction, emergency stop, fume extraction, safety light barrier, Laser cutting machine from our showroom with 150-watt laser power Delivery time: immediately available ----- Switch on and start working ----- ----- Machine with only approx. 10 operating hours ----- ----- Year of manufacture: 2025 ----- ----- Professional-grade machine ----- - incl. Windows 11 PC system / monitor / keyboard / mouse - Pre-installed cutting and engraving software in German - Fully integrated and ready for immediate use - Capable of extremely fine engraving as well as precise cutting of thick wood or acrylic (PMMA) - Machine was only used for demonstration purposes - Highly versatile cutting system - Cuts wood up to 20 mm thick - Cuts acrylic and various other plastics - Cuts fabrics, nonwoven materials, etc. - Cuts rubber sheets - Engravings on wood, concrete, stone, many plastics - Production of stamps - Heavy-duty industrial quality - Travel range: 1300 x 900 mm - Drives with hybrid servos - Linear guides on all axes - reci laser tube with 150 watts peak output - incl. honeycomb worktable (removable / extendable) - incl. knife blade table (removable / extendable) - Sheets up to approx. 20 mm thick can be fed through the machine - Continuous processing possible - incl. generously dimensioned laser chiller - incl. high-capacity extraction system Lredjfkgq Aopfx Akqek - Very easy to operate - Machine control in German - Machine controller in German with large color display - Highly reliable data transfer via USB and network cable - No hassle with occupational safety authorities - All spare and wear parts are in stock Please also see our attractive leasing/financing offers. Sale exclusively to commercial customers. Delivery / consultation / sales only in Germany / Austria / Switzerland Machine dimensions approx.: Width: 200 cm Height: 125 cm Depth: 150 cm Shipping weight: approx. 600 kg