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10.2 Feeding Speed
Feeding speed refers to how quickly the gun is moved along the weld joint, measured in inches per
minute. It can vary based on conditions and the welder's skill, limited by their ability to control the weld
pool. The push technique allows for faster feeding speeds compared to the drag technique. Gas flow
should match the feeding speed, increasing with faster feeding and decreasing with slower speed.
Feeding speed should match the amperage and decreases as material thickness and amperage
increase.
Too Fast Feeding Speed
Too fast feeding speed results in insufficient heat per inch of travel, leading to less penetration and
reduced weld fusion. The weld bead solidifies quickly, trapping gases inside and causing porosity.
Undercutting of the base metal may occur, leaving an unfilled groove in the base metal.
Too Slow Feeding Speed
Too slow feeding speed produces a wide weld with inadequate penetration and fusion. The arc energy
remains on top of the weld pool, resulting in excessive weld metal deposition per inch and poor-quality
weld deposits.
Correct Feeding Speed
The correct feeding speed maintains the arc at the leading edge of the weld pool, allowing sufficient
melting of the base metal for good penetration, fusion, and wetting out of the weld pool. This produces a
high-quality weld deposit.
11. MAINTENANCE
! WARINING BEWARE OF ELECTRIC SHOCK!
NOTICE: To prevent serious injury, fire, and burns:
Unplug the welder.
Place the MIG gun on a heat-proof, electrically non-conductive
surface.
Allow all parts of the welder to cool completely before servicing.
11.1 Routine and Periodic Maintenance
•
Before Each Use -Check over machine and accessories for any obvious condition that may prevent
safe performance or operation, repair or replace items as necessary to correct any abnormal
condition.
• loose hardware
• misalignment or binding of moving parts
• damaged cord / electrical wiring
• frayed or damaged cables
• cracked or broken parts
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