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Quality impact due to shield gas purity for welding

Quality impact due to shield gas purity for welding

Quality impact due to shield gas purity for welding

(OP)
Refer to ASME II SFA 5.32, minimum argon purity is 99.997%.
- What are the quality impacts in case of use lower purity (99.9% or 99.95%)?
- Please advise me about some technical references for the subject.
Thanks in advance...

PAN

RE: Quality impact due to shield gas purity for welding

Increased porosity, increased potential for hydrogen cracking, decreased ductility to name a few quality related problems in welds.

RE: Quality impact due to shield gas purity for welding

You can Google shielding gas purity effects for technical information. There is information and numerous papers on this topic.

RE: Quality impact due to shield gas purity for welding

(OP)
I have read a book "Welding Essentials - Questions and Answers" by William Galvery and Frank Marlow. The book describes about welding grade argon with minimum purity of 99.95%.

I intend to use filler metal SFA 5.18, should I use minimum gas purity 99.997% per SFA 5.32? Is it mandatory requirement?

Some experienced personnel in my company comment that the requirement of SFA 5.32 is not practical in the oil and gas industries.


 

RE: Quality impact due to shield gas purity for welding

SFA 5.32 is not mandatory unless required by Contract specifications. Acceptable workmanship quality can be obtained using 99.95% purity Argon shielding gas with carbon steel welding filler metals under SFA 5.18 provided you do not require very low temperature impact property requirements.  

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