Stop in for a cup of coffee

Dam just found the owners manual and my answer, pretty cool.

H. SPOT TIMER (STITCH TIMER)


After the torch trigger is actuated,

the timer allows the wire

to feed and the gas and power to

flow for the time selected. The

Function Switch must be set in

the "SPOT" position (or the

"STITCH" position for stitch


welding).

http://www.800abcweld.com/pdf/fm140a_owners_manual.pdf