Hi guys,
Ive done a bit of oxy welding ali ,doing tubing and fittings for auto air/con hoses etc. Its easier than doing sheet ali though. Doing klonks panels Ive found cleanlyness very important, a slightly carbon flame to reduce oxidisation and a heatsink behind the weld makes a big differance and catches any melt downs. I use a no 6 tip with a smallish flame, then carbon black the weld area with the acetlene flame, and then heat the area slowly untill the carbon dissappears, this is an indication you are nearing the welding temp, then start playing with the rod in the flame on the weld, keep the torch moving over and around the weld other wise holes will appear. I like 3mm rod as anything smaller melts as soon as you put it into the flame and you cant poke and play with the parent material to find out how soft the ali is getting. Keep plenty of flux on the weld. Ive run out of rod and have had trouble with welds cracking when trying to panelbeat, so will try using some of the old panel next time but Ive been abit busy. Remeber the heat will buckle the panel and you will have to streighten it again.
To panelbeat dents use a slapper and pine backing dolly for flat areas and use the hammers for corners and curves. The slapper doesnt leave marks like the hammer does. and its going to streach if you hit it hard using hammers with steel dollys.
Have fun.
Cheers Steve

