TM-716 Page 14 MSW And LMSW Series
Tips arcing on material. Not enough tong pressure. Increase tong pressure.
Tips not aligned correctly. Realign tips or dress tips to proper diameter (see Section 3-1).
Base material may be welded to tips causing high resistance and poor electrical current flow. Clean or
dress tips (see Section 3-1).
Spatter or molten material being ex-
pelled out during welding operation.
Incorrect tip alignment. Dress tips so that they align and are flat on the material (see Section 3-1).
Excessive tong pressure. Reduce tong pressure.
Output amperage too high. Reduce amperage setting, if applicable (not available on air-cooled mod-
els).
Weld time too long. Reduce weld time.
Inconsistent weld nugget. Inconsistent weld time. Install a weld timer, if applicable.
Not enough tong pressure. Increase tong pressure.
Hole in middle of weld. Contact area of tips is too large. Change to a smaller tip diameter or dress tips back to original diame-
ter (see Section 3-1).
Poor weld or no weld at tips. Material too thick for spot welding machine. Check that material thickness is within capacity of spot
welding machine.
Tongs are too long. Reduce tong length.
Remove coating from material for intimate contact between pieces. Remove oxides and chemical
compounds including galvanized coating.
Spot weld delay timer TD1 not
functioning properly.
Be sure that all spot weld delay timer TD1 leads are secure.
Replace spot weld delay timer TD1.
Notes
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