E 309L welding with/without preheating

• Aug 17, 2023

• #2

kingnero

Mechanical

Aug 15, 2009

1,759

For 2" think carbon steel, I'd apply at least some preheating...
Take care to avoid lamellar cracking. Have recently had this problem with welding padeyes on low carbon steel, 25-30 mm thick base metal. They ripped right off.

 

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• Aug 17, 2023

• #3

r6155

Mechanical

Jan 12, 2010

2,774

Which is the code?

Regards

 

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• Aug 17, 2023

• #4

weldstan

Materials

Jun 24, 2011

2,749

You should preheat at 200F minimum. High residual welding stress + high potential for martensitic structure in HAZ makes potential for HAZ cracking high.

 

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• Aug 17, 2023

• Thread starter
• #5

Jap1

Structural

Aug 16, 2023

11

Thank you for your valuable advice. I'll keep it in mind that preheating is needed. As I cheched carbon content of A36, it's quite high.
We are located outside of US, but we build it for the US customer,so I'm not sure which code is applied. It's not a pressure vessel, as welders don't need a pressure welding ticket.

 

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• Aug 17, 2023

• #6

r6155

Mechanical

Jan 12, 2010

2,774

Be careful. The welding procedure specification and welder must be qualified for this example.
AWS D1.1 is for structural.
Regards

 

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• Aug 17, 2023

• #7

kingnero

Mechanical

Aug 15, 2009

1,759

We're talking 2" thick A36 in a dissimilar weld, with an OP who's asking about preheat, and you guys are worrying about the certs? I'd say there are bigger worries than the paperwork here.

 

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• Aug 17, 2023

• Thread starter
• #8

Jap1

Structural

Aug 16, 2023

11

I should have mentioned this earlier, but this is T joint that requires 3/8" fillet weld. The 304L chamber is reinforced with 2" mild steels. If anyone thinks that preheating is not necessary, I would like to hear your thoughts.

 

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• Aug 17, 2023

• #9

r6155

Mechanical

Jan 12, 2010

2,774

If (OP) doesn't know the code and there's no mention of a service, how can someone decide whether to preheat or not?
Please, if someone answers, tell the reference.

Regards

 

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• Aug 19, 2023

• Thread starter
• #10

Jap1

Structural

Aug 16, 2023

11

I don't want to disclose the detail, but it's a melting furnace shell. I'm not concerned about a code and I would rather know about any cracking issues for this particular welding. I'm asking here because I think that hydrogen dissolves in austenitic weld metal and does not diffuse into the HAZ of A36 steel, but it appears that precaution and preheating are necessary.

 

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