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Old 02-29-2008, 09:59 AM
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chromoly tubing

i need to make some parts from chrome moly tube, what are the requirements for welding chromoly? mig, gas, or send it out to be tig welded? thanks for any input

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Old 02-29-2008, 10:44 AM
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Hi Doug,
Chrome molly needs to be tig welded, & for wall thickness over .120" needs to be heat treated, & after welding stress relieved, plus other things, send it to someone who knows how to tig 4130

Take care,
Rich
PS I think you can oxy/acc weld it but I'm not sure.
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Old 02-29-2008, 01:14 PM
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i was pretty sure tig was the way to go, i,ll fit everything and then send it out. thanks. doug
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Old 02-29-2008, 11:20 PM
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If they are non structrual parts you can weld them with MIG or even gas if you are very good with either. Just use the best wire or rod. E 70-s2 or E70-s6. Best bet is to have them TIG welded however. You need very good fits regardless of weld method... ie no gap rod is available for this material.
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Old 02-29-2008, 11:30 PM
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Here is some info on 4130

Check this out..and yes it can be gas welded as that method was the only one available for a lot of years..

Sam
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Old 03-01-2008, 12:58 AM
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Good info. I had opportunity to check my welds in an actual "field test".

Last fall I hit a solid tree with our sand buggy at about 60 mph. It hit square in the middle of the left front suspension. The impact bent one A-arm 90 deg just a cleanly as if done in a press brake. On 2 of the mounting tabs the 3/8 grade 8 bolts ripped right thru the tabs which were 3/16 4130 mounted in double shear. All 4 remained attached to the chassis but bent over 90 deg. The mounting tubes remained straight and intact.

2 of the 4 5/8 chrome moly rod ends broke off right at the last thread. The break was in tension as the thread area was considerably reduced. The other 2 ripped the rod end bungs off the unbent A-arm which was 1 1/4 x .120 wall 4130 tubes about 2 inches past the welds. In other words the tube simply tore apart. No welds failed anywhere. The impact also tore off the top of the shock absorber but did not damage the welded shock mount. The tie rod simply had the rod end pulled right thru the clevis otherwise the welded part was intact.

Other than the big bruises from the 5 point seat belts I wasn't damaged.

I did get retrebution as almost all of the bark for about about a foot and a half on one side of the tree was gone so it will be firewood by now. haha
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