PAW WELDING - PLASMA WELDING TECHNOLOGY.

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Features

• Protected Electrode - Secluded from contamination by atmosphere and base-metal, allows for many hours of non-interrupted service.
• Controllable Arc - Can use tip orifice size, electrode set-back and gas flow rates as “mini-tuners.”
• Multi-Gas Capabilities - Allows for operation of various gases for enhanced welding performance.
• Pilot Arc - Provides “absolute”  arc transfer… Every time.

Common Gases

• Plasma Gas
• Argon - Inert, Most Used.
• Argon/Hydrogen - 98/2 Mixture. Hotter Arc, Torch Parts Have Shorter Life, Hard to Transfer Arc.
• Shield Gas
• Argon - Used for ALL Metals, Most Common, Good Arc Stability, Good Cleaning Action - Even Below 20 Amps.
• Argon/Hydrogen - 95/5 Mixture - Used for Stainless, Nickel and Nickel Alloys, Hotter Puddle, Reduces Surface Tensions of Puddle Allowing Increased Travel Speeds, Fluxing Effect on Oxides.
• Helium - 25% Hotter than Argon.  Used on: Aluminum, Copper Alloys, Thicker Titanium. Difficult Arc Transfer, Cost More than Argon, May Need Gas Trailing.

Melt-In Fusion - Most Common Transfer

“Like TIG Welding”

Advantages:

• Reliable arc starting   
• Protected electrode   
• Less sensitive to stand-off changes  
• Improved arc stability at low current
• Lower current levels required
• Reduced heat input or distortion
• Arc is more directional (less arc wander)
• Improved weld geometry and penetration control

Typical Welds/Joint Configuration:

• Spot fusion welds
• Corner/edge fusion welds
• Flange fusion welds
• Square butt fusion welds
• Surface fusion welds
• Lap fusion welds

 Keyhole Welding

Advantages:

• Reduced current levels
• Single-pass welds
• Minimized weld preparation
• Narrower weld beads
• Visual proof of 100% weld penetration
• Improved weld geometry
• Less filler material required

Disadvantages:

• Limited to flat, horizontal and vertical-up positions
• More sensitive to variable changes
• Limited to automated operations
• Types of Welds/Joint Configuration:
• Typically square-butt welds

Electrode Setback  - Minimum setback is defined as the electrode set flush with the end of the Welding Tip. For any other setback use setback gauge.  Minimum setback will give you soft arc, a TIG like Arc.

Welding TIP – The orifice diameter designates the maximum current the tip can carry. The maximum current is the pilot current plus the welding current.