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Gas Tungsten Arc Welding Handbook
Melt-through. Occurs at a gap in the weld joint or place where metal is thin.
How to correct:
• Decrease current.
• Increase arc length.
• Increase travel speed.
• Decrease root opening.
Concave root surface. The root of the weld penetration does not extend below the lower edges of the joint.
How to correct:
• Decrease travel speed.
• Decrease amperage.
• Decrease arc length.
• Increase fi ller wire deposition.
Icicles. Weld penetration beyond the joint root is uneven.
How to correct:
• Move the torch throughout the weld length
in a consistent pattern.
• Add fi ller metal as required to maintain an
even penetration.