PowerPro 205SI AC TIG pre-flow not coming on

[DTuer]

The first time I TIG on AC the pre-flow works but subsequent welds the arc starts immediately without any pre-flow. Any ideas?

Thanks
Don

[christian]

Gee,

It may be possible that you're just reinitiating a subsequent arc start while the post flow is still going, so you're not hearing any newly initiated pre-flow starting, i.e. if your post-flow is at 20 sec, turn it down to about 5 sec.

I usually only set for about .5 sec of pre-flow, if at all.

[performance]

The first time I TIG on AC the pre-flow works but subsequent welds the arc starts immediately without any pre-flow. Any ideas?

Thanks
Don

If you are using in 2T or 4T or even pedal, and pull away and break the arc before the arc cycle is properly terminated, this could be a cause.