Originally Posted By MR_P_BODY
Originally Posted By CMcAllister
Depending on who you ask, the desired filler for 4130 is ER70S-2, ER80S-D2 or even 312 (stainless). Most seem to lean towards the ER70 because of it's slightly lower strength and weld qualities. It's not quite as finicky as the higher strength material. The ER80 when mixed with the base metal, approaches the hardness of 4130. The ER70 weld doesn't get quite as hard. The result is the weld has a bit of "give" which can help prevent cracking or breaking in an impact situation without sacrificing strength in a properly designed assembly. I use ER70S-2.

TIG welds on properly cleaned, prepped, and welded joints will be pretty. If not, you need to fix what's wrong.



I also use the er70 for CM... have been all along... I tried playing
with other fillers when I was back working so I could test the
failure points and ended up sticking with er70
wave

Well, I have a Snap-On MM135 welder and I found my (long forgotten) flex tig setup still new in the box. The flex tig will allow Tig welding of steel with the MM135 welder. So my question is what diameter ERS-70 rod do I need for welding roll bar tubing and suspension tubes? I am guessing that ER70 is short for ER70S-2. Trying to research buying some welding rod.

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