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[MW:16379] welding of alloy 800HT

By Materials & Welding
Dear all,

we have to weld Alloy 800 HT material for steam methane reformer outlet header using TIG methodology and filler wire ER NiCrCoMo-1 . However, due to access constraint, we are having doubt on effectiveness of argon purging during welding.

It may be noted that after root run of few portion, inner surface of weld was inspected and found to have shiny surface but base metal adjacent to weld bead is having grey color marks.

now the question is:

1. How to check effectiveness of argon gas purging while welding with respect to root weld profile?
2. What kind of problem may come in future, if purging was not proper for weld?
3. Can we apply SMAW welding procedure for complete weld profile ( root, hot, filler and final passes)?
4. Few portion of old weld has been left on inner surface of pipe, whether it will affect the new weld or quality of weld?
5. Is there any other filler wire suitable to weld such kind of material?
6. Effect of interpass temperature ( i.e. 200-250 deg C),if not strictly maintained ?

Thanks and regards,
Pratap


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