spot welds

[sandancer]

when i am doing spot welds, i am getting a little hole left in the middle, what am i doing wrong ??

 

[Lawnmowerboy]

Do you actually mean spot welding as this is a completely different process to doing a single tack or plug weld with a mig welder. Getting a little dimple on the top of a tack weld is very common with mig and often to do with the burnback adjustment on you machine if it has it.

 

[sandancer]

sorry i mean a single tack, it is not a dimple, is it a hole, i do not have a burn back adjustment on my machine

 

[Lawnmowerboy]

Is it a little bit that pushes up from the weld just as it goes off red colour. This is likely a gas or contamination problem. Is there any chance you can post a pic of what's happening.

 

[sandancer]

no, it is a hole in the middle, i will put up a pic next time i am in the workshop
cheers