Jasic MIG 250C, Operator'S Manual

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TIG WELDING PROBLEMS
Before starting any welding activity ensure that you have suitable eye protection and
protective clothing. Also take the necessary steps to protect any persons within the welding
area.
TIG welding defects and prevention methods
Defect Possible cause Action
Excessive bead build up, poor
penetration or poor fusion at the
edges of the weld Weld current too low Increase the welding amperage
Poor material prep
Weld bead flat and too wide or
undercut at the weld edge or burning
through Weld current too high Decrease the welding amperage
Weld bead too small or insufficient
penetration Welding travel speed too fast Reduce your welding travel speed
Weld bead too wide or excessive
bead build up Welding travel speed too slow Increase your welding travel speed
Uneven leg length in fillet joint Wrong placement of filler rod Re - position filler rod
Tungsten melts or oxidises when
welding arc is made TIG torch lead connected to +
Little or no gas flow to weld pool
Gas cylinder or hoses contain
impurities
The tungsten is too small for the
weld current
TIG/MMA selector set to MMA
Connect to - polarity
Check gas apparatus as well as torch
and hoses for breaks or restrictions
Change gas cylinder and blow out torch
and gas hoses
Increase the size of the tungsten
Ensure you have the power source set
to TIG function