Q:TIG Welding Common Troubleshooting

Porosity

1)Base metal contaminated with oil,

rust and other contaminants

1)Clean workpiece surface by chemical

or mechanical methods before welding.

2)Poor gas shielding

2)Excessively high nozzle or fast

travel speed; use qualified inert

gas

3)Blocked gas line

3)Replace gas supply pipeline

2)Tungsten electrode melting

2)Use low current and thicker

tungsten electrode;

excessive electrode extension

3)Incorrect use of oxidizing gas

3)Replace with inert gas

4)Filler wire touches the tip of

hot tungsten electrode

4)Operate skillfully; avoid contact between filler wire and tungsten

electrode

Unstable arc

1)Base metal contaminated

1)Thoroughly clean base metal before welding

2)Contaminated electrode

2)Grind off contaminated sections

3)Over-sized tungsten electrode

3)Select suitable thinner tungsten

electrode

4)Improper tip shape of tungsten electrode

4)Regrind the tungsten electrode

tip properly

5)Excessively long arc

5)Lower nozzle properly to

shorten arc

Severe electrode

 burn-off

1)Use reverse polarity connection

1)Use thicker tungsten electrode or switch to straight polarity

2)Poor gas shielding

2)Enhance shielding: increase gas

flow, lower nozzle, reduce travel speed, clean nozzle

3)Mismatch between tungsten diameter and

current

3)Use thicker tungsten electrode or lower current