EQT FAILURE

By kalyanmani Date 11-21-2015 03:42

we have conducted Electrode qualification test for E6010 & E7010 P1 as per code and also maintained interpass temperature.but during tensile test the test result was not as per code ASME Sec II part C. as per code elongation min % should be 22 but we are getting around 16. we have conducted the same twice but the result was negative.can you please tell me what is the actual procedure to follow and are there any certain variables to be followed ? And does the tensile test specimens should be heated at 95 deg to 105 deg and air cooled before conducting tensile test? And what is the preheat temperature and inter pass temperature to be maintained? does the base metal shows any effect in test results if we use MS Plates?
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Thanks

By 803056

Date 11-21-2015 18:46

The first thing to come to mind is properly aging the test coupon after welding to permit the hydrogen to effuse from the weld. How long did you allow the welded coupon to sit before testing it?

Al

By kalyanmani Date 11-23-2015 09:20

48 hours

By 803056

Date 11-23-2015 15:49

Any obvious defects on the fractured surfaces? Other than that, I've got nothing.

Al

By welderbrent (*****)

Date 11-22-2015 23:21 Edited 11-22-2015 23:25

You did use the correct preheat? Seeing they are not low hydrogen electrodes? Just checking.

He Is In Control, Have a Great Day, Brent

Oh, how forgetful of me:

WELCOME TO THE AWS WELDING FORUM!!

By Don56

Date 11-24-2015 20:52

ASME SFA 5.1 does not list an electrode E7010. Do you mean E7018?

You may soak the coupons for up to 48 hours at 90-105 deg. C before tensile testing.

What do you mean by MS plate?

By js55

Date 11-25-2015 13:48

there seems a lot of confusion here.
P1 is a base metal designation and yet you are qualifying filler?
And why would you qualify two different fillers simultaneously?
Especially when they come from separate specifications.
Filler pads are stacked so that dilution from the base metal is minimized.