First of all you are trying to weld something with weld metal with all of the fluidity of a caterpillar.
Welding 800 isn't easy and where i worked 40 (count 'em ) years ago we would weld from both sides and dye pen the weld
at 25 % ,50 % ,75 % and the completed weld before we would X ray so as to keep the weld clean.
Inconel 82 is the recomended wire ( ER NI -CR - 3 ) but you might try Inconel 617 (ER Ni Cr Co Mo ) as it is a dispersion
hardened alloy and has good creep resistance and as a fall back try the ER Ni CR Mo -3 but be warned that this alloy contains
Mo and could lead to some sigma phase brittleness if you are talking about 4000 + hrs at 1500 " F
The penetrant inspection is the way out of the porosity. What gas /gas mixture are you using ? What is your application ?
Thanks Cobra for your input. We found the problem, it was the filler wire.
Apparently, that batch of rod was on recall;
The company has recalled thousands of dollars worth of that filler wire.
I guess they made a poor batch.
The application is for an oil refinery.
damn ravi i havent heard anyone speak so technical in a very longtime. i had a welder tell me that about 8" of his root pass fell away like cracked glass falling from a window. he was welding 9chrome pipe for a steam generator. have you ever heard of this or experienced it? this was about 5yrs ago at haynes gnerating station in seal beach, ca. i just cant picture it happenin.
havent heard of it Was it on the steam plants or the gas turbines ?
well this plant had a combination of both but it was on a steam line going into the steam generator.
Hi.
We had some problems with welding (GTAW) Alloy 800HT recently. After macro tests our laboratory found some strange zones located between weld and HAZ, but what is important, those zones appeard not in HAZ but in the weld. The wire we have used is ERNiCrCoMo-1. We have no idea what it could be.
Have you ever got any problems like that?
Pehaps you can clarify some. I tend to think what you are looking at may be what is called an unmixed zone. Ni based alloys are so viscous that there will be a thin line of base metal that completely melts but does not mix with the weld metal. Its essentially an autogenous type zone. I think this unmixed zone probably happens in all welds its just that with less viscous materials it would be perhaps difficult to detect.
With some alloys there are some rather odd phenomena in this zone, and it will etch differently.
Thank you for your answer.
Could you provide me your e-mail address?. I will send you an image of macro sample. Maybe it will clarify some.
We decided to make additional micro test to gain some particular information.
The point of this situation is we don`t know if those zones could be dangerous in case of corrosion at 950 C degrees.
Regards
Peter
If memory serves, one of the biggest issues with the unmixed zone is segregation. This could, depending upon the alloy and service, create concern for corrosion resistance.
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