Why is it called a weld coupon?
Why do they call a weld test coupon, a coupon? that one really threw me a curve too when i was learning to weld. especially in the south where the emphasis is on the first syllable. Coupon in Metallurgy a sample of metal or metalwork submitted to a customer or testing agency for approval.
What are weld coupons?
+ Follow. The pictures shown below are of weld test coupons which were recently used to test a welder’s skills. These pieces of metal called “coupons” have had straps cut out for destructive testing and then reattached to the coupon after they were tested.
What is test coupon?
A coupon or test coupon is a printed circuit board (PCB) used to test the quality of a printed wiring board (PWB) fabrication process. Test coupons are fabricated on the same panel as the PWBs, typically at the edges.
Can you reuse welding coupons?
When practicing welding, reuse weld coupons (metal you are welding on) until all surfaces have been welded on.
What is weld crack?
Weld cracking refers to a depression left at the termination of a weld where the weld pool is left unfilled. Most forms of weld cracking result from the shrinkage strains that occur as the weld metal cools. If the contraction is restricted, the strains will induce residual stresses that cause cracking.
What are welding coupons?
a weld or braze assembly for procedure or performance qualification testing. The coupon may be any product from plate, pipe, tube, etc., and may be a fillet weld, overlay, deposited weld metal, etc.
What are coupon materials?
What is the maximum root opening?
The maximum permissible root opening is 1/32-in. unless the joint is backed sufficiently to prevent the welding composition from flowing through the root opening. With such support greater root openings can be used.
When can practicing welders reuse coupons?
the general rule is that the arc length should be the same as the diameter of the electrode. When practicing welding, reuse weld coupons (metal you are welding on) until all surfaces have been welded on.