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Questions From New Drivers Newbie White Line Fever. Forum/Message Board for new truckers or those wanting to become a trucker to ask experienced drivers a question, and get their advice. New drivers can post questions and experienced drivers can help.

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Old 05.07.2007
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Technical Question
FMCSA regulation part 393.201 (Frames) states, parts and accessories cannot be "welded" onto the frame except in accordance with the vehicle manufacturer's recommendations. What exactly does this mean? Can I not weld anything at all to the frame of my truck?? Do I have to bolt everything I want to attach to the frame no matter what it is?? Thanks.
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Old 05.08.2007
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From what I gather from what you posted, is that you can weld, but you must adhere to the manufacturer's specifications.
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Old 05.08.2007
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“A frame section supported at each end loaded in the middle is in compression at the top and in tension at the bottom,” he said. “There is a neutral axis where there is no stress in the frame. Holes and welding at the neutral axis will not significantly affect frame strength. Holes and welding near the flanges can cause frame failure. Chassis manufacturers restrict the size and location of holes, and most also restrict welding on the frames.”

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Old 05.08.2007
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The frame is hardened steel,your not supposed to weld on it as the molecules will spread and weaken the frame,but the really important thing is welding on your frame causes a chemical reaction and can ruin your engine and also cook your sensors and especially your computer if you have one in your system. its really high tech but you need to ask a cat dealer,or diesel certified mechanic and a certified welder. all you need to do is ask the question on goggle,they will answer it one way or another.
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Old 05.08.2007
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Quote:
Originally Posted by heyns57 View Post
“A frame section supported at each end loaded in the middle is in compression at the top and in tension at the bottom,” he said. “There is a neutral axis where there is no stress in the frame. Holes and welding at the neutral axis will not significantly affect frame strength. Holes and welding near the flanges can cause frame failure. Chassis manufacturers restrict the size and location of holes, and most also restrict welding on the frames.”
brings back memories of mechanics of materials.


holes also cause stress concentrations, where the frame can start cracking leading to fracture.
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Old 05.14.2007
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Originally Posted by newguy111 View Post
FMCSA regulation part 393.201 (Frames) states, parts and accessories cannot be "welded" onto the frame except in accordance with the vehicle manufacturer's recommendations. What exactly does this mean? Can I not weld anything at all to the frame of my truck?? Do I have to bolt everything I want to attach to the frame no matter what it is?? Thanks.

What are You trying to weld to the frame??????????????
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