No. P10224
P. 25 / 47
10. WELDING OPERATION (continued)
10.7 WELDING CONDITIONS
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If the improper welding conditions are set, the following problems will occur.
CAUSE TROUBLE
Welding current too large.
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Deep penetration.
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Holes or brakes on welded metal when welding thin plate
when welding thin plate.
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Wide bead width.
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Increase in excess metal length.
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Increase in leg length.
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Easy overlapping.
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Bead dropping or undercut at some welding positions.
Arc voltage too high.
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Long arc length.
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Wide bead width.
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Decrease in excess metal length.
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Easy occurrence of blowhole.
Arc voltage too low.
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Sticking through base metal and spatter.
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Narrow bead width.
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Shallow penetration.
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High excess metal.
Welding speed too fast.
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Narrow bead width.
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Shallow penetration.
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Low excess metal.
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Easy undercut.
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Easy occurrence of poor gas shield.
Wire extension too long.
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Long arc length.
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Large potential drop and output voltage decrease caused by
resistance heat generated from wire extension part.
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Shallow penetration.
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Easy generation of poor gas shield.
Wire extension too short.
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Short arc length.
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Deep penetration.
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Spatter.
Torch angle too large.
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Wide bead width and shallow penetration at angle of advance.
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Easy occurrence of convex bead width and deep penetration
at angle of sweep back.
Penetration too shallow
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Narrow bead width.
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Shallow penetration.
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Easy overlapping.
Penetration too deep.
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Wide bead width.
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Deep penetration.
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Easy occurrence of hole or break (when welding a thin plate).
Rate of gas flow too high.
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Easy lacking of lack of arc at low current.
Rate of gas flow too low.
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Easy generation of poor gas shield at large current.
