Cracking when welding carbon steel to stainless
Cracking when welding carbon steel to stainless
(OP)
Hi, I need some help! We are having issues with welding carbon steel parts to stainless steel parts. We are getting cracking of the weld, usually on the root pass.
The carbon is generally A105 and and the stainless 304 or 316. It is a highly restrained full penetration bevel joint, and we are having cracking using both 309 filler and ERNiCrMo-3 filler.
I am not sure what else to try to eliminate this cracking, any advice would be helpful, thanks!
The carbon is generally A105 and and the stainless 304 or 316. It is a highly restrained full penetration bevel joint, and we are having cracking using both 309 filler and ERNiCrMo-3 filler.
I am not sure what else to try to eliminate this cracking, any advice would be helpful, thanks!





RE: Cracking when welding carbon steel to stainless
RE: Cracking when welding carbon steel to stainless
http://www.FerrellEngineering.com
RE: Cracking when welding carbon steel to stainless
RE: Cracking when welding carbon steel to stainless
RE: Cracking when welding carbon steel to stainless
RE: Cracking when welding carbon steel to stainless
Thanks for the advice, I'm going try a sample with a hefty dose of preheating to see how it reacts.
RE: Cracking when welding carbon steel to stainless
Have you looked up coefficients of thermal expansion? These vary with the grade of stainless steel, and it appears, with grades of carbon steel too.
RE: Cracking when welding carbon steel to stainless
which is the tichness?
in the past i got the same problem, i solved it in this way:
1) clean very well the parts to be joined, there no should be grease on them, the best way to do that is using acetone :) that is a secret :)
2)whic gas do you use? C02 2% Argon 98?
3) metal filler AISI 307,
the most importants thing is to use a low current 170- 180 Ampere, go pretty fast, to obtain a small bead.
aisi 307 is not expensive filler metal, than hastelloy
and this procedure do not require preheating
if you have need to know more you can contact me personally my email is matteomunari@yahoo.it
greetings
RE: Cracking when welding carbon steel to stainless
The first pass needs to be big, with a lot of heat input into the base metals. For a big, meaty bead try Gas shielded Flux-core FCAW-G with an amperage of 200 or higher. Alternatively, stick weld SMAW using 1/8" rods E309-16 or -17.
The welder cannot stop welding for a coffee break until the joint is at welded at least 1/3 of the way out. This will have enough strength to resist tearing due to shrinkage, and each new bead will stress-relieve the bead under it, compensating for shrinkage.