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You are watching: Is it illegal to weld a semi truck frame


Hi all. I simply bought a 1986 3/4 ton GMC High Sierra 4X4 and also there is a small split on the outside challenge of the best rear framework rail. I figured out a means to weld feet the other day and also would favor to shot it with a MIG welder. Can you phone call me what kind of stole the frame is made the end of (I\"m reasoning carbon steel) and also whether or no I deserve to fix it v a MIG welder? Thanks!Jesse
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not sure around your truck, but on 18 wheelers, i have actually seen quite a couple of times a glowing yellow sticker:FRAME IS MADE out OF heat TREATED ALLOYDO no WELD!!so, yeah, folks weld castle left and right anyway. I deserve to tell most of the alloys by spark. You deserve to prolly look at it increase on google..
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Theoretically, correct you could weld it. Practically, no really a an excellent idea. The weld will alleviate the toughness of the frame, probably by as much as 80%. Far better to v bolt a metal brace, IMO, if girlfriend can, but if a structure is bad, it normally can\"t be economically correctly repaired.Post a photo if girlfriend can.
\"The first time you carry out a repair on your car, it takes 4 hours, minimum. The second time, 1/2 an hour. There never ever is a second time, though.\"
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1. Any heat cure alloy is annealed thereafter, or it will crack; as well hard; taking welder to it overhardens alloys, as they harden at room temperature.2. Any type of long objects will certainly warp, if a neighborhood high heat is applied. That;s why they typically do this in jigs, under longitudinal stretch, to prevent warp. I second huge on this. Drill and also brace. Basically, shackle it. Or even better off, rid that it. Donate and write turn off on taxes. One way or the other you repair it, it will only gain weaker.

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Oh yeah, you need a high torque, short RPM drill and also a yes, really expensive drill little bit to obtain through a structure rail.
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Weld a cosmetic patch, grind it down and also sand it, repaint it and sell it. J/k :whistling2:
\"The first time you execute a repair on her car, it takes 4 hours, minimum. The second time, 1/2 one hour. There never ever is a second time, though.\"
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I really should disagree through the remainder of the posters, in general. Over there is usually no problem with welding a frame yet the twist is, that does call for somebody the knows what they room doing and also understands just how to repair it and why you repair it together you do. As well, you require to number out why that cracked and consider that once considering a repair. If the metal is degraded (it is 25 year old ~ all), the framework may have rusted sufficient to make it unrepairable.The comparison to a semi tractors frame is no a proper comparison. A semi uses various metal and also it is much different in the loads put on it. That is high tensile strength metal that is quite prone to damages by improper heating. You truck is very different and not topic to the same stresses.Now, you execute not just go willy nilly welding a crack and think that is repaired though. Depending wherein the cracked is and also the problem of the abutting metal, you normally need to use a fish plate. This is other that unless you room the agree at the welding shop the repairs frames, you take it it come the pro at the welding shop the repairs frames. The is a really serious matter and also shouldn\"t be tackled by a novice.So, if you desire to save the truck, discover a weld shop the does structure repairs and let them inspect the thing to recognize if it really is repairable.