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Welding 304L PLate to A500B Tube
- Thread starter atlarson
- Start date
Not sure what an A500B is as I don’t have the spec. However if it were a normal weldable carbon manganese steel you would use a higher alloyed stainless filler wire such as a 309.
The problem is dilution, as you mix carbon steel with stainless steel you create a chrome steel which is very hardenable, even a 309 consumable may not be suitable if dilution is high. Do a procedure test and run a hardness survey across the joint to make sure you have no hard areas.
You might get some useful help and guidance from consumable suppliers/manufacturers
Regards
john@gowelding.com
The problem is dilution, as you mix carbon steel with stainless steel you create a chrome steel which is very hardenable, even a 309 consumable may not be suitable if dilution is high. Do a procedure test and run a hardness survey across the joint to make sure you have no hard areas.
You might get some useful help and guidance from consumable suppliers/manufacturers
Regards
john@gowelding.com
diamondjim
Mechanical
atlarson,
I am impressed that the aerospace specs
did not cover the type of weld. I would
contact them. They may be able to offer
some info, but maybe you are lucky not
to have a spec by them. Maybe it is some
liability issue. Do the welds have to be
certified?
I am impressed that the aerospace specs
did not cover the type of weld. I would
contact them. They may be able to offer
some info, but maybe you are lucky not
to have a spec by them. Maybe it is some
liability issue. Do the welds have to be
certified?
i agree with welding1, that 309 is the filler of choice for most "stainless" to carbon steel welds. he also mentions that dilution can cause a problem.
my experience has been that if i am to machine this connection after welding, i will use er347.
i am not a metallurgist, but i suspect the niobium and tantalum prevent the formation of "hard spots". all other properties are similar to 309--it's just a little pricey.
finally, as diamondjim mentions, if this is a liabilty issue, let the DE's come up with a welding procedure. maybe they'll bolt it instead!
my experience has been that if i am to machine this connection after welding, i will use er347.
i am not a metallurgist, but i suspect the niobium and tantalum prevent the formation of "hard spots". all other properties are similar to 309--it's just a little pricey.
finally, as diamondjim mentions, if this is a liabilty issue, let the DE's come up with a welding procedure. maybe they'll bolt it instead!
Electrode selection is determined from the base metal chemistries and the percent weld admixture. The electrode should produce a weld deposit with a small amount of ferrite (3-5 FN) needed to prevent cracking. Use 309L (including ER309LSi) when joining mild steel or low alloy steel to stainless steels.
To all---I've been using 309 wire and stick when joining SS with SAE1020 or 41whatever TS with very good results over the years.
To chph---never tried E347---any other reason for this beside what you mention?
To diamondjim---I have found it rather common to lack weld specs on equiptment from outside contractors for aerospace tooling. It never became a problem for me but, I can see the possibility/probability of abuse.
Rod
To chph---never tried E347---any other reason for this beside what you mention?
To diamondjim---I have found it rather common to lack weld specs on equiptment from outside contractors for aerospace tooling. It never became a problem for me but, I can see the possibility/probability of abuse.
Rod
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