Is there any penalty on weld joint Failure 3

[mak72]

Dear All,
I had Radiography Test (RT) for several weld joints and found few are rejected due to porosity. Our Client is insisiting to have more test (we have 5% of the joints) as a penalty of the failure. Is there any penalty on failure of weld joint.
Regards
MAK72

 

[eyec]

most times i have seen 10% and if 10% of those get rejected then you do another 10%, if you get another 10% reject then it goes to full RT of welds.

 

[HouseHark]

sounds about right, depends on which spec, some call for 2 welds extra from welders who made repairs.

need a spec to confirm

 

[kelowna]

Standard practice in my industry and very sensible precaution.
1- Set testing frequency
2- No problems, reduced frequency can be considered
3- Problems detected, increase frequency, sometimes as much as 100% until problems disappear.

 

[zdas04]

Statistics would say that if you have a representative sample of 10% of the population, the percent failed welds can be extrapolated to the population. So if 10% of the 10% are bad then you can be confident that something like 10% of all the welds are bad, rarely an acceptable outcome on a job where you are bothering to test.

Like the other posters, I would look at the data and any welder with a failed weld would get 20% X-Ray the next day. If ANY of those welds fail I would do 100% of that guy's welds until you get around to running him off.

David

 

[kelowna]

Another comment.

Welders hate to repair welds. We always make sure that the welder that had the weld failed is the one repairing it. It goes a long way to make sure he improves.

 

[dcasto]

I agree with Zdas04 on that. I've seen many welders go home. I've let them retest a week later or so and let them back to work after some time out.