AISI 4130 Pipe Welding Issue
AISI 4130 Pipe Welding Issue
(OP)
We are experiencing differences in the weldability and weld quality between two different sizes of 4130 pipe. The welding procedure requires a 400F preheat with 650F max interpass temp. The root is E6010 with E10018-D2 H4R for fill and cap. Welds made in the NPS 2 pipe were as expected but NPS 4 were not. The welder complained of the E10018 being "watery" and having trouble with tie ins. The same welder and electrodes were used for both. MTRs for the pipes are attached. Why would there be such a difference in welding?





RE: AISI 4130 Pipe Welding Issue
RE: AISI 4130 Pipe Welding Issue
RE: AISI 4130 Pipe Welding Issue
RE: AISI 4130 Pipe Welding Issue
If the pipe is magnetic, then you'd need to do a chem analysis to determine for sure what it is.
RE: AISI 4130 Pipe Welding Issue
RE: AISI 4130 Pipe Welding Issue
RE: AISI 4130 Pipe Welding Issue
RE: AISI 4130 Pipe Welding Issue
RE: AISI 4130 Pipe Welding Issue
I'm not surprised the tensile test results are what they are. I'm surprised they are as high as they are unless you removed all the 6010 when the samples were machined.
The PWHT sounds fairly long for the thickness of the pipe wall.
Consider using a filler metal with a better chemical match.
Best regards - Al
RE: AISI 4130 Pipe Welding Issue
RE: AISI 4130 Pipe Welding Issue
Best regards - Al
RE: AISI 4130 Pipe Welding Issue
RE: AISI 4130 Pipe Welding Issue