Re: [MW:27521] Nick break test

1. It looks like the row of interlocked pores near one external surface of the fracture-surface could be giving you more of a notch-effect (aka "stress-concentration") than in a defect-free sample.
2. A possible cause of the pores are poor shielding of the arc due to moisture-entrainment.
3. The nick-break test was developed at Lehigh University in the the middle of the last century. Why are you using it now? An example of the use of this test is in the Welding Journal in about 1955, by W.J.Murphy and Robert Stout.

Ed Dalder
Very old welding metallurgist.

On March 15, 2018 at 2:59 AM Mani kandan r <manikandanr21@gmail.com> wrote:

Dear gents,

Pls find the attached Nick break test coupon, what is the type of defect? & how to control this?

Process -GTAW+ SMAW

Thanks & Regards,

R.Manikandan

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