As part of a fabrication process, type AISI 303 stainless steel threaded fittings have to be joined to a type
AISI 304 stainless steel head using fillet welds. Both SMAW and GTAW have been tried with 308L, 316L and
309L filler metals, but the welds frequently crack and leak. The chemical compositions of the alloys are given
the table below.
Q1.1. Briefly describe the possible cause of failure of the welded joints. Motivate your answer by referring to
the relevant failure mechanism.
Q1.2. Will type 312 filler metal be a better choice in this application? Refer to any problems that may be
experienced when this filler metal is used.
Alloy | Cr | Ni | C | Mn | Si | Other |
AISI 303 | 18.5 | 9 | .05 | 1.75 | .5 | MIN 0.15 S |
AISI 304 | 18.5 | 8.5 | .05 | 1.75 | .5 | - |
E308L | 19.8 | 9.8 | 0.025 | .75 | .95 | - |
E309L | 23.0 | 12.5 | .025 | .8 | 1.00 | - |
E316L | 19 | 11 | .025 | 1.5 | .35 | 2.7Mo |
E312 | 22.2 | 8.8 | 0.11 | 0.05 | 1.00 | 0.1Mo |
https://materials-welding.blogspot.com/
https://www.linkedin.com/groups/122787
---
You received this message because you are subscribed to the Google Groups "Materials & Welding" group.
To unsubscribe from this group and stop receiving emails from it, send an email to materials-welding+unsubscribe@googlegroups.com.
To view this discussion on the web visit https://groups.google.com/d/msgid/materials-welding/dc2f5578-7773-42d3-b699-da36d9eaa049%40googlegroups.com.
No comments:
Post a Comment