18 years ago
I'm a beginning welder that bought a Lincoln 135Sp+ about two weeks ago.
This evening I was
welding two .125" mild steel pieces together using a butt joint and after a
couple of inches my ability to lay down a good bead seemed to deteriorate.
I got stubbing and whiskers with little penetration. I don't think I was
changing anything (angles, proximity, stickout) during the weld. I've got a
fresh tank of gas operating at the called for pressure (20lbs).
I was wondering if I was running into a duty cycle problem. I realize that
at almost maximum voltage and amperage that I'm more likely to bump up
against this, but I'm not sure what happens when the duty cycle boundaries
are exceeded. How long can I weld until I have to put the gun down and let
everything cool down? What happens when the duty cycle is exceeded -
component overheating, internal CB or fuse tripped? Or does it change how
well the welder performs?
If this isn't it (and believe me, I'm perfectly willing to accept operator
error as the cause), any suggestions as to what I may be doing to change
the performance mid-weld?