FAQ's

NACE MR0175 and orbital welding of austenitic stainless steels

Welding Requirements for Welded and Annealed Stainless Steel Tubing

Introduction

This webpage provides answers to questions related to the welding requirements of welded and annealed tubing made from stainless steel sheet material that qualifies under Section A.2 of NACE MR0175/ISO 15156-3. The tubing is formed, longitudinally welded without filler metals using an automatic arc welding process (ASTM 249/ASTM 269), and then fully annealed per ASTM.

Question

Is the welded and annealed tubing bound to the welding requirements of A.2.3 and 6.2.2? Additionally, does butt welding two ends of the tubing using the orbital weld (no filler metal) process without additional anneal bind the tubing to A.2.3 and 6.2.2?

Answer

According to NACE, in both cases, the tubing is bound to the welding requirements of A.2.3 and 6.2.2, as long as the hardness values are below 22 HRC, since it is still considered a weld even if no filler material is used. This pertains to NACE MR0175/ISO 15156-3 Annex A.2.3, and the reference cited is ISO 15156 Maintenance Panel Inquiry #2004-19 Q2.

Conclusion

In conclusion, welded and annealed tubing made from stainless steel sheet material that qualifies under Section A.2 of NACE MR0175/ISO 15156-3 is bound to the welding requirements of A.2.3 and 6.2.2, even if no filler material is used. It is important to ensure that the hardness values are below 22 HRC.

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