Century MIG Wire Feed Welder Operator's Manual download pdf (Page 20)

VERY thin or excessive filler metal

build-up and minimal penetration is

acceptable•

Always select the HIGH heat setting with

the burn-through method prior to making

a spot weld.

2• The PUNCH AND FILL METHOD

produces a weld with the most

finished appearance of the three

spot weld methods. In this method,

a hole is punched or drilled into the

top piece of metal and the arc is

directed through this hole to

penetrate into the bottom piece.

The puddle is allowed to fill up the

hole leaving a spot weld that is

smooth and flush with the surface of

the top piece.

Select the, heat setting, as if you were

welding the same thickness material

with a continuous bead.

3. The LAP SPOT METHOD directs

the welding arc to penetrate the

bottom and top pieces, at the same

time, right along each side of the

lap joint seam.

Select the heat setting as if you were

welding the same thickness material

with a continuous bead.

SPOT WELDING INSTRUCTIONS

•

Select the heat setting

recommended above for the

method of spot welding you intend

to use.

.

.

Hold the nozzle piece completely

perpendicular to and about 1/4 inch

off the work piece•

Pull the trigger on the gun and

release it when it appears that the

desired penetration has been

achieved.

.

.

Make practice spot welds on scrap

metal, varying the length of time

you hold the trigger, until a desired

spot weld is made.

Make spot welds on the actual work

piece at desired locations.

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