Why can cellulosic electrodes (root,fill and cap) be used on natural gas transmission lines and not used in process or power piping. Why one and not the other. Hydrogen embrittlement comes to mind.....must be something else?
Sftyvlv
currently we are using an F4 SMAW (root,fill and cap)procedure on a job welding a335 p11 5 inch double extra heavy skid piping for a reheat furnace.
Our welders are having trouble rooting this v groove joint and I'm wondering if using an approved procedure using aws 8010 as a root pass might be...
Hi folks:
I've seen this before but hadn't thought much about it because nobody seems to care.
Having said that, on several occasions I've seen in use a compressed air manifold with a receiver, with 8 outlets on it or so.
Upon further investigation, noticed no construction tag on it and nothing...
Where can I find transition temps for a312 in the code books.
I'm just starting as a level 1 welding inspector,QC (Canada) and just learning.
Thanks
Sftyvlv
On a recent post I mentioned a condensor line that was Rt'd instead of a hydro (because the line could not be isolated).
My question is could any other form of ndt been done.
This line did not meet the requirements of Rt under B31.1.
In the previous post I was asked if the customer had...
I have a 20"condensate line that terminates in the main condensor of a 500mw steam turbine. The pipe is A106 sch 40 20". The wps calls for a gtaw root pass with Er70s-2 wire and smaw 7018 root, fill and cap.
The service temp and pressure are 50 psig and 350 deg F.
A hydrostatic test was...
If austenetic stainless develops carbide precip at 450C and up, why does my weld data sheet require my interpass temp to be 300F.
This is 304L sch 80 pipe. Gtaw 308L root, Smaw 308L fill and cap.
Thanks
Sftyvlv
On our weld data sheets at work we have all the parameters to do a given job, accompanying this is a PQR and WPS.
My question is concerning preheat and interpass heat values. Depending on the material,how do they arrive at these values and are they based on upper and lower critical temps.
Sftyvlv
Hey folks:
You did such a good job answering my last question, I thought I'd ask another.
The "weaving" technique. How many electrode dia (using SMAW) and why? Does this apply to all other manual and semi automatic welding processes?
Thanks
Sftyvlv
Can someone tell me where in the B31.1 code weldolets must be used and why. To me "olets" in many cases seem to be overkill especially when a 3M forged coupling with a full penetration and fillet weld would do the job, unless the pipe wall thickness is excessive.
Sftyvlv
I have asked the question "downhand vs uphill" progression on root,fill and cap passes,when welding pipe. Why do "pipeliners" run down and process and power piping welders progress uphill, what is the difference? No one seems to be able to help.
Can you please give me an explanation?
Sftyvlv
