Plasma Torch of the Automated Weld Overlay Machine

The plasma torch integrates water, electricity, gas, and powder supply systems. Through it, the plasma arc is generated and welding is completed, making it the core component of the welding process.

Plasma Torch Host Parameters.

The Plasma Torch (also known as the Plasma Welding Gun) is the device responsible for generating the plasma arc. It incorporates water, electricity, gas, and powder supply mechanisms. This torch produces the plasma arc to melt powder materials and the base surface to complete the welding process, making it one of the core components of the entire plasma weld overlay system. Deewi Automation has independently developed its Plasma Torch, offering a range of specifications to choose from. Common specifications include: 500A, 300A, 160A, 100A, 80A, among others. Detailed parameters are as follows:

ModeDWPT-50019
Main arc polarityTungsten electrode to negative electrodeWork piece to positive electrode
Pilot arc polarityTungsten electrode to negative electrodeNozzle to positive electrode
Tungsten electrode dimension6.0mm
Arc voltage90V
Current30-500A 80% duty cycle
Cooling typeCirculation cooling of main arc and pilot
Nozzle coolingWater cooling
Ionic gas0.6~6L/min
Shielding gas5~25L/min
Powder feeding gas0.6~6.0L/min
Powder feeding gas circuitTwo gas paths enter independently
Powder feeding volume8kg/h Max
Powder typeMetal powder
Granularity70~200um
Powder feeding typeBy the feeding hole
ModeDWJPT30018-HQ
Main ArcWater-electricity integration
Tungsten electrode-WorkpieceNegative-Positive
Mode of Tugsten4.8
Arc Voltage90V
Welding Current30-300A 80% temporary load rate
Pilot ArcWater-electricity integration
Tungsten-NozzleNegative-Positive
Pilot Arc Current3-20A 100% Temporary load rate
Mode Powder feedingAggregate
Volume Powder feedingMax. 150g/Min
Gas Powder feeding1.0-3.0L/min
Type PowderAlloy Powder
Size Powder70-200um
Passage Powder feedingDuble gas passage
CoolingCircular cooling
Ion gas0.5-6L/min
Shield gas5-25L/min
Nozzle CoolingWater cooling directly
Diameter Nozzle3.0-5.0 mm
Length Cable5 m (customized avaiable)
ModeDWPT8013-HQ
Main ArcWater-electricity integration
Tungsten electrode-WorkpieceNegative-Positive
Mode of Tugsten2.4
Arc Voltage90V
Welding Current3-80A 90% temporary load rate
Pilot ArcWater-electricity integration
Tungsten-NozzleNegative-Positive
Pilot Arc Current3-20A 100% Temporary load rate
Mode Powder feedingAggregate
Volume Powder feedingMax. 50g/Min
Gas Powder feeding1.0-3.0L/min
Type PowderAlloy Powder
Size Powder70-200um
Passage Powder feedingSingle gas passage
CoolingMain arc cooling
Ion gas0.5-2L/min
Shield gas5-25L/min
Nozzle CoolingWater cooling indirectly
Diameter Nozzle0.8-2.5 mm
Length Cable4 m (customized avaiable)

Structure drawing of Plasma Hardfacing Torch:

1. gas shield, 2. copper nozzle locking ring, 3.  copper nozzle, 4. middle ring,  5. surfacing gun body,  6. tungsten electrode,  7. tungsten electrode clamp, 8. welding gun cap

Composition of the Plasma Torch:

The plasma torch assembly is typically divided into three components: the upper torch body, the lower torch body, and the insulating body. The upper torch body holds the tungsten electrode and has inlets for water and electrical connections. The lower torch body houses the nozzle assembly and connections for water, electricity, gas, and powder. The insulating body in between isolates and secures both the upper and lower torch bodies. The torch body is cast as a single piece, ensuring good sealing, durability, and safe usage. The quality of the nozzle is excellent, boasting a long lifespan and straightforward maintenance and replacement.

Plasma Torch Installation Precautions and Instructions:

Proper use and maintenance of the plasma torch are fundamental for its long-term stable and safe operation. When replacing the nozzle, sealing ring, center ring, or other components, it’s imperative to ensure the machine is turned off for safety reasons. During the replacement, the height of the welding torch should be above the water tank level to prevent cooling water from flowing into the powder delivery pipeline. When disassembling and assembling the tungsten electrode, ensure the welding machine arc is turned off. Before replacing the sealing ring, inspect it for any scratches or damages. Only install it into the sealing groove once you’ve confirmed it’s in new and flawless condition.

Maintenance and Usage Instructions for the Plasma Torch:

  1. Before use, inspect the equipment to ensure that the welding torch and connections for water, electricity, gas, and powder are correctly installed and securely fastened.
  2. When using the plasma weld overlay torch, ensure the cooling water is in circulation.
  3. The recommended welding angle for the plasma torch is between 80-110 degrees. If the angle is too wide, spatter will increase.
  4. Regularly clean the nozzle to prevent it from being clogged by powder.

Safety Precautions for the Plasma Torch:

  1. Before using the torch continuously, ensure it is adequately cooled. When the welding machine is not in operation, it should be set aside only after the power has been turned off for 10 minutes.
  2. Proper ventilation and fume extraction systems should be employed to eliminate the smoke produced during welding, and the emissions should comply with local environmental protection standards.
  3. Maintain a dry and tidy working environment. Lay insulating mats on the ground. Workers are required to wear protective clothing, welding helmets, and insulating gloves. Ensure that personnel and flammable materials stay away from flames and fumes. It’s strictly forbidden for workers to directly touch electrified or heated components.

Deewi Automation Technology Co.,Ltd.

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Address: 333 Yima Road, Shanghai, China
Email: de@overlayweld.com
TEL: +8621 6868 2002

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