Re: Welding on Big box store bikes?
If your blowing holes your using to much heat! dial it down and your feed. If you use to low of heat though, it heats up the surrounding base metal alot more than short concentrated welds. I also wouldnt use flux when welding so no smaw. But mig and definatly tig will be just fine.
I think the guy at the bike store was trying to sell ya something, or he was thinking about aluminum. Some aluminum alloys are heat treated, and you want to preheat those before you weld them and postheat after. Others are not and do not require it.
Heat treatable series: 2000, 6000, 7000.
Non-heat treatable: 1000, 3000, 4000, 5000.