PlZ Find the answer for your queries
1) Should we only preheat the CS forging and mention the same on the
WPS ?
Preheating is not required at all (Ref. ASME VIII non mandatory
appendix R (R-1 and R-7))
2) What should be the appropriate preheat temperature and on what
location to preheat?
NA
3) On what plate thickness should i qualify the Welding procedure in
order to qualify the base metal thickness range i.e for 800mm dia.
forging?
Based on ASME IX table QW-451 Procedure Qualification Thickness Limits
and Test Specimens min thick of test coupon is 10 mm because the max
thickness to be welded in site is 20 mm whatever dia size.
4) Should i qualify the joint on a dissimilar thickness with weld
deposition of only 20 mm, so what thickness of plates should i
select?
You should qualify on dissimilar metal with min 10 mm deposit weld it
will qualify up to 20 mm
Ref table QW-451 Procedure Qualification Thickness Limits and Test
Specimens
Regards
Petroinspect
+974 566 4894
---------------------------------------------------------------------------------------------------------
On May 21, 6:10 pm, "PREM SHANKARDUTT NAUTIYAL"
<prem_nauti...@rediffmail.com> wrote:
> Hi friends
>
> I want the advice of senior members to help me out in qualifying a typical welding procedure as per ASME Sec IX.
>
> We want to weld a 800mm dia. SA105 Gr.B (Carbon steel)forging to a 20mm thick SS304L shell (circumferential seam).
> Length of both members is @ 2metres.
>
> The solid forging is tapered and is welded to the 20mm thick SS304L with a full penetration joint where the depth of bevel is 18mm and thickness of both members at the joint is 20mm.
> The joint is single V. Only final weld LPT required.
>
> Now logically this 800mm dia. forging will have to be preheated to @150 degrees celcius i believe, but what about SS304L.
> Our client has strictly told us that SS304L shell shall not be preheated.
> The reason being distortion and a wider HAZ, however i believe that preheating to 100/150 degrees celcius will not change the structure of SS304L and hamper mechanical properties - UTS and bend.
>
> Now i have 2 queries:
>
> 1)Should we only preheat the CS forging and mention the same on the WPS ?
>
> 2)What should be the appropriate preheat temperature and on what location to preheat?
>
> 3)On what plate thickness should i qualify the Welding procedure inorder to qualify the base metal thickness range i.e for 800mm dia. forging?
>
> 4)Should i qualify the joint on a dissimilar thickness with weld deposition of only 20mm, so what thickness of plates should i select?
>
> Please advice !
>
> Regards
>
> Prem S Nautiyal
> Godrej, Mumbai.
>
> PREM S NAUTIYAL
> CELL : 9820313278
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