undercut weld?

[dunc78]

Just wondering what the cause if this is(along the top edge), is it too high amps?

 

[StickNtig]

Can be a combination of things, amps/volts too high, travel speed, torch angle etc

 

[backpurge]

Try turning the volts down for starters

 

[dunc78]

Thanks will do.

 

[Lawnmowerboy]

wire speed up too may help