MK Welding Multi-GMAW 200 LCD PFC - Page 98

67
EN
metal
Damp electrodes
Use only dry electrodes
3
Excessive Spatter
Amperage too high
Decrease the amperage or choose a
larger electrode
Arc length too long
Shorten the arc length
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 base 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. Seek assistance for the correct
joint design and fit up
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, practise 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