MIG or ARC Welding Settings Rule Of Thumb?

by Ron Elliot

Hi. Is there a rule of thumb or general rule initially to determine the settings for mig welding or arc welding before beginning? I'm considering a small steel patch on my truck frame which has rusted out where an open "C" channel portion of the frame joins a "box" type. The lower rounded edged of the frame have rusted just above the rounded part leaving the bottom portion still intact.

I just want to weld a piece or pieces to the sides and bottom all the way to the top in order to strengthen it before any actual breakage or weakness occurs. I'm thinking metal of at least 1/8" thick or slightly thicker should do the trick but I have to locate such plate or angle steel. Ron Elliott.

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Sep 08, 2013
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Experience
by: Anonymous

Hi my welding experience is very limited especially in this type of endeavor, although I do have some knowledge of preparation of the area to weld just not actual positional experience. I have also contacted a neighbor who is a licensed welder if i need some help or if I decide to have someone do the job.

Sep 07, 2013
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Truck Frame Repair
by: Anonymous

I buy old Nissan 4x4's (early 80's) all the time for cheap for just that reason, rusted frames.

I use 1/8 flat, run straight pieces wherever possible, then custom cut the angled pieces to fit between and weld it up solid.

Basically, just build a new frame over the old one, always making sure that you reinforce well beyond the rusted areas to solid frame.

Not rocket science and it has passed the vehicle inspection where I live.

One question: do you have any welding experience?

Sep 06, 2013
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truck frame
by: Ron Elliottt

Hi Leroy I understand the part about frames being bent and designed for strength. That's why I'm asking questions and doing some research before tackling the job. In addition I also am able to see that where this spot is has to be repaired soon (as I'm not currently driving the truck to avoid further damage due to stress)in order to catch it in time before further damage occurs.

Sep 06, 2013
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welding a rusted frame patch
by: Leroy

A truck frame that has rusted through can be patched if you can weld around the patch. If you don't have access to the whole area with your torch or stinger, patching may not work. Frames are mechanicly bent for strength welding can weaken the frame if not done properly. You may only be able to run a few strings of beads over the hole. The rule of thumb I try to follow is do no further harm. Asking questions is how we all learn. Best wishes.

Sep 05, 2013
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MIG and ARC Welding Machine Tips
by: Stevel

That's a pretty broad question, not sure I can be of much specific help.

For GMAW (MIG), there is typically a chart on the welding machine that provides voltage/ wire speed settings. Often these are not actual V/WS, just a reference number to match the dials on that specific machine. If the chart is missing, you may be able to find a similar welding machine with the chart or get the info from the manufacturer.

Other than that, you'll just have to set up some practice pieces (same thickness and position of the weld you intend to make) and start experimenting until you get the weld you want. Keep in mind, for MIG, the metal has to be completely clean. Grind off the mill scale on new metal and any paint or rust on the existing frame.

For SMAW (arc welding), the setting all depends on the type and size of the welding rod, the weld position, and most importantly, welder skill. How much heat can you handle. Here again, set up some practice pieces and experiment.

Which ever process is used, set up some metal as close to the actual weld as you can. Then practice until you feel comfortable. When you weld on a frame, you want to get it done, not dally around throwing more heat on it than necessary. You also want to avoid severe undercuts, which can be a starting point for cracks. Welding on truck frames is "different" and you may want to do a little research on it.

Steve.

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