Well I am recalling back when I ran a welding business
and I've welded everything from HEavy Equip Dozers etc down to .050 SS
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One time I even reworked the whole front end of a Delorean that was made up to look like the back to the future car
Most of it was made out of 16 Ga (Thin, bent etc)
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About 2008 a guy asks me if I can weld on his Toyota Fender because it was coming apart
I am used to older 70's Fords, I drive a '92 Dodge, so I said sure.
You can actually screw in a sheet metal screw into their steel and have it hold a mirror back on
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That Toyota Tacoma fender was so thin from the factory I kept burning through even with tiny tack welds
I had to butter each side up with weld, then stitch each side back together very slowly
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by comparison I had a '63 Ranchero that I poked a hole in the front fender at work by accident
took the fender off, pounded the steel back into shape, and zipped it up with a MIG
No issues and didnt have to baby it while welding.
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There was no way doing that to the newer Toyota, it was like you could almost dent it with thumb pressure and lean on it.
But yeah I get it, they want them lighter plus going to half the thickness of metal also saves money right?
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Another comparison to that
I was doing some backhoe work in the backyard and had the backhoe extended and didnt look and was backing up and the tractor stopped
I had hit my '75 Scout in the front end just above the grill
it barely dented the hood and completely stopped the tractor in low gear.
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Just my experience
I'll keep the Old 70's -'90's trucks myself