Melt back damaging tips

[IanP]

When welding 0.6 mild steel sheet using 25 amps on my Cosmo 200 and 0.6 wire I get a slightly cold and somewhat weak weld. If I increase the amperage (heat) then I get a much stronger weld, much faster but find that the wire tends to melt back to the tip and fuse with it, in 20 mins welding this happened three times. Has the forum any tips / reasons to avoid this?
Regards Ian

 

[J.B. Welding]

Hi Ian,
3 things to try, first speed up the wire a bit, 2nd adjust the burnback setting on your welder, if it has one. 3rd pull the torch away from the weld just before you release the trigger to leave the wire out a wee bit. (And if your not replacing 40 tips an hour already a new tip!) Good Luck!


bmfweldertraining.co.uk

 

[cracker666]

As my sip, and the comment above, you need to speed up the wire feed.
Try on some scrap cleaned of course.
For plug welds I'm on low high and wire feed at 2oclock?.
For 1mm but welds low medium wire feed around 10 - 11 o'clock.