@ EdStainless, thank you for your input. In your opinion, is there a number of repairs permitted on such materials?
@ weldstan, thank you for your insight. Good to see that there is some allowance when it comes to field work. If the weld could've been accessible from the inside do you think...
DekDee - ASME B31.1. I'm currently drawing up a request with an attached procedure.
weldstan - That was my idea, grind a bigger length, feather properly and re-weld. If I may, what made such repairs unsuccessful in your opinion ?
Thank you for all your replies so far.
The welder has passed the required skill test and welded a PQR ( ASME IX) piece with succesful results ( both NDT and Mechanical testing).
The above mentioned defects were found during fabrication on the project. As r6155 said, the defect's root cause is...
Dear eng-tips,
What would happen in an already existing HAZ after performing a weld repair?
More info:
- materials SA335 P91 and A234 WP91. After NDT was performed incomplete penetration was spotted, dimension of the pipe and cap is 355,6 x 11,13 mm so re-welding form the inside is not...
Dear Gents and Ladies,
I'm currently doing a job that involves P91 welding and after RT testing we got incomplete penetration on a 20 mm length ( VT inspector missed it during welding).
Backgroung :
- Materials are A335 P91 ( 355,6 x 11,13 mm Pipe) + A234 WP91 ( 355,6 x 11,13 mm Cap). Pipe is...
Thank you for all the answers. Your input in very appreciated. I think i have a better understanding now of what happens when you re-heat a stabilised SS.
@EdStainless. We are welding thicknesses ranging from 3 mm to 25mm( design temps. ranging from 490C to 660C), most of the products are not...
Dear Gents,
I've been trying to understand the welding metallurgy of stainless steels. I'm working mainly with 321 material(347Si filler) and one particular problem with this can be KLA. I've understood that during re-heats of an existing joint the Niobium carbide / Titanium carbide can...
@kingnero Thank you for your input.I'll conduct a pre-qualification test to observe the level of oxidation on the back side, just for my information.
@EdStainless Thank you for your valuable insight. If TiO2 is present then re-welding the root pass won't be sufficent as HAZ will also be...
Hello everyone,
I need to qualify a PQR acc. to AWS D1.6 on TP321 base metal. In existing PQRs of my current employer i see that similar tests were made on test coupons that were not back gouged or purged whitch means that "sugaring" occurs and every destructive test( tensile, bend, macro...
@XL83NL I've looked through API 577 and API 582 and everything points to ER347. We only do the Splitter part of the Flue Gas Silencer, maybe thats why its AWS, but this is a shot in the dark. We're welding plates of 3mm and 5mm thickness, joint designs of II, 1/2V and a2/a3 FW and FN readings...
Hello all,
Product: Flue Gas Silencer
Design code : Not specified but PQR must be acc. AWS D1.6
Base Material : A240-TP321H
Design temp. : not specified but considering the base metal I'd say between 500 C - 800 C
Question : I'm having trouble chooting a filler metal for this type of steel. My...
Hello friends,
Can anyone help me with an interpretation for API 6A's 7.3.4.6 regarding Impact testing for welding procedure qualification. I am particulary interested in the first statement as this is vague when im translating it in my native language and it is not clear when you have to...
@XL83NL I am new to this forum, ill take that into consideration next time i will start a thread.PQR and welders must be qualified as per ASME IX and i dont know how to translate the names of the parts in english so ill just upload a picture.Position's 2 dimensions:Ø32, 7 mm thick.
