H&S HSM250 - Page 79

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4
Weld sits on top,
lack of fusion
Insufficient heat input
Increase the amperage or choose
a larger electrode
Work piece dirty,
contaminated or moisture
Remove moisture and materials
like paint, grease, oil, and dirt,
including mill scale from metal
Poor welding technique
Use the correct welding
technique or seek assistance for
the correct technique
5
Lack of
penetration
Insufficient heat input
Increase the amperage or choose
a larger electrode
Poor welding technique
Use the correct welding
technique or seek assistance for
the correct technique
Poor joint preparation
Check the joint design and fit up,
make sure the material is not too
thick for wire size.
6
Excessive
penetration - burn
through
Excessive heat input
Reduce the amperage or use a
smaller electrode
Incorrect travel speed
Try increasing the weld travel
speed
7
Uneven weld
appearance
Unsteady hand, wavering
hand
Use two hands where possible to
steady up, practice your
technique
8
Distortion −
movement of
base metal during
welding
Excessive heat input
Reduce the amperage or use a
smaller electrode
Poor welding technique
Use the correct welding
technique or seek assistance for
the correct technique
Poor joint preparation and
or joint design
Check the joint design and fit up,
make sure the material is not too
thick. Seek assistance for the
correct joint design and fit up
9
Electrode welds
with different or
unusual arc
characteristic
Incorrect polarity
Change the polarity, check the
electrode manufacturer for
correct polarity