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  1. metaleng123

    Weld Repair metallurgical influence in Gr.91 welds

    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...
  2. metaleng123

    P91 correct repair procedure

    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...
  3. metaleng123

    Knife-line Attack prevention when welding 321 SS

    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...
  4. metaleng123

    Effect on mechanical properties of welding stainless steel without gas purge

    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...
  5. metaleng123

    A240-321H filler metal

    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...
  6. metaleng123

    API 6A interpretation

    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...
  7. metaleng123

    Welder qualification ASME IX

    I currently use a welder qualification for S355J2H, BW, thickness 25mm (1"),Ø 298,5, SMAW.Can i use this qualification for a FW, Ø60, thickness of 10mm and the same material quality? If i understand correctly from ASME IX Table QW-452.6 regarding Filler Qualification by Groove-Weld Tests all...
  8. metaleng123

    Welding S355NL2 for a special requierments project.

    Hello everyone, I have to write a welding tehnology for some parts that must be guaranteed at -60(-76 F). To give you some information, there will be both butt welds and fillet welds and the thickness will range between 10-20 mm( 0.39" - 0.78"). I usually weld this type of material(PNo.1)...
  9. metaleng123

    API 6A hardness testing

    Hello everyone, As per API 6A, hardness testing on 100% of all accessible pressure-containing, nonpressure-containing and repair welds shall be performed after all machining operations or it should be tested only when the customer requiers it? Thank you

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