FAQ's

NACE MR0175 and orbital welding of austenitic stainless steels

Question:

My stainless steel sheet material qualifies to Section A.2. I am forming this sheet into tubes and (longitudinally) welding the formed tube without filler metals using an automatic arc welding process (ASTM 249/ASTM 269). After welding the tube is fully annealed per ASTM. My hardness values are all below 22 HRC as required. A. Is my welded and annealed tubing bound to the welding requirements of A.2.3 and 6.2.2? B. After annealing, if I now butt weld two ends of the tubing above using the orbital weld (no filler metal) process (no additional anneal), am I now bound to A.2.3 and 6.2.2?

Answer:

A. Yes, this is still a weld even if it was made without filler materials.

B. Yes.

This question is in relation to NACE MR0175/ISO 15156-3 Annex A.2.3

Reference: ISO 15156 Maintenance Panel Inquiry #2004-19 Q2

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