Posted by Ben Aylesworth on April 05, 1999 at 21:22:11:
In Reply to: Cheap Advice (it's free) posted by Winget on April 05, 1999 at 07:12:31:
Actually my wire feed is flux-cored. The flux is baked into the centre of the wire, providing the same effect as "sticks," but infinetly more portable than mig, (no gas tank) and less hassle than stick (no rod oven!)
As far as metal/weld strength (for arc/mig/tig), look at the lable on the wire or the rods. There should be several numbers, such as the gauge of the wire/rod, whether it is fluxed (?) or not, and the weld strength. This number represents the thousands (yes thousands) of pounds a proper weld will tolerate. This is usually around 70,000 lbs. Sounds like a lot, but think about the pounds per sq. inch and the miniscule area welds cover. Make em good, or don't make em, period!
As far as metal strength vs. heat, Winget is right, to a degree. The metal will chrystalize with heat, but avoiding excessive heat which causes weakness/warpage is part of the art.
Gas welding is fine for strength, but it takes a delicate and practiced hand (I'm not that good yet) but the weld strength is comparable, theoretically. The gas torches are quite safe if properly kept up. Keep the threads sealed, etc. The pops and such are normal, if they are recurrent, try cleaning the tip. Tip cleaners are good, but a good rub on the concrete/bricks with the flame on works well too! Enjoy playing with the fire, I know I do!
Thanx,
Ben