Not the proper filler but for welding thin sheet metal regular g.i. Wire will do..a lot of fab shop that i seen used "alambre" pag naghihinang ng g.i./thin sheet.i tried it before mausok at minsan pumuputok pa..

Pwede rin mig wire pag dodoblehin mo lang yung wire then twist mo lang using power drill.

Kung brazing or for joining disimilar materials,copper etc..use brass rod( requires flux/borax)it can be bought at your local hardware store sizes vary from 3/32 to 1/8,3 feet in lenght AFAIK.

Thanks bro hugel. Got myself some copper rod for brazing ok naman siya with the use of borax. Recently bought a couple of tig copper plated steel rods. Havent tried it out yet. Now im on the look out for a #5 welding goggles. Any lead where i can get one bro? Tnx again.

found and ordered this #5 oxyacetylene brazing/welding goggles at lazada.com for those interested:
[h=1]Fibre-Metal Xtralite ANSI Z87.1 Gas Welding and Cutting Goggles [/h]