This is project 6, from dgarnier, Fillin' holes

[parkour]

I have heard of using copper as a backup material.
It will not contaminate the weld like a brick could, and will provide a smooth surface finish.

[dgarnier]

Would it weld to the back side?

[sportbike]

Would it weld to the back side?

Nope. Copper is often used as a back-up material. Best to find somehting fairly thick though as this sheet will not work. Also, copper will conduct the heat fairly quickly, this can be good or bad, depending on the situation.

[Tritium]

I used some half inch thick copper bar stock when first testing my PU 205P DC tig from Everlast. I was able to weld together 2 stanley disposable knife blades. They were not as pretty as I would have liked, but not bad for a first tig attempt. Without the copper backing I am sure I would have just blown holes in them.

Thurmond

[dgarnier]

next time I am at the scrap yard I will have to see what they have in the way of copper

[SeanMurphy265]

Brass also works very good! I think Harbor Freight sells a brass spoon for filling in holes.

[scootarida1]

QUOTE=SeanMurphy265;12533]Brass also works very good! I think Harbor Freight sells a brass spoon for filling in holes.[/QUOTE]

That woulda been helpful on my 16ga exhaust build with scratch start only