Size of test coupon for pipe

[skrie85]

What the minimum size of test coupon for welding pipe?

[Karthik]

Hi, For welder qualifications it shall be 150mm length per side(i.e.,150mmx2pcs.) as a general practice.But as per code 75mmx2pcs (total length-150mm) is enough. But for PQR,it shall be of minimum 150mm of weld length (as per code).for this you have to conside the diameter of pipe.If weld length of pipe used in PQR is less than 150mm,you have to use 2 or more specimens.Also for mechanical test,there shall be enough specimen length for testing (tensile,bend,impact if any etc.,) pls.refer with ASME QW-462 for test specimen dimensions.sometimes it may need more than 150mm of weld length. Thanks & Regards, (karthik) Karthikeyan.S QA/QC Manager Getabec Energy Co.,Ltd. 379,Moo6,Soi8,Nikhomphatana, Rayong-21180, Thailand. Phone: 0066 38 897035-8 (Off) Fax: 0066 38 897034 Hand Phone: 0066 892512282 --- On Wed, 8/18/10, skrie85 <skr...@yahoo.com> wrote:

-- To post to this group, send email to material...@googlegroups.com To unsubscribe from this group, send email to materials-weld...@googlegroups.com For more options, visit this group's bolg at http://materials-welding.blogspot.com/ The views expressed/exchnaged in this group are members personel views and meant for educational purposes only, Users must take their own decisions w.r.t. applicable code/standard/contract documents.

[Muhammad Bilal]

Hi,

 

For Mechanical Testing: If its a butt welded pipe, pipe on both sides of weld should be long enough to be tested for tensile and bending. Other than that hardness and chemistry (if required) can be done on any size of specimen. But the diameter of pipe is very critical since it will determine how many samples you will be able to extract for testing.

 

Regards