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akpipelineengr, B31.4 do not specify that but thank you for sharing the possible hard weld problem. I'm not yet well-versed in welding. As for the weld proximity, the client spec has a provision for small fitting that allows minimum weld spacing; I simply want to maximize this spacing as much...

Hi guys, I have typically designed with a minimum repad thickness of 1/2" on welded branch connections. This time around, I am dealing with a 4" branch on a 36" run pipe. The problem is with a 1/2" repad, I have a weld proximity issue where the repad weld toe is only 1 mm away from the adjacent...

The clearance is between 2-8 thou (an article from a steel company noted 2-3 thou is optimum) and the 4140 will be tempered at 1100F max to get the 25-32 HRC. Thank you all for the input. This gives me a starting point to discuss with the machinist. Greatly appreciated!

Hi all, I am designing a hot tap pilot drill insert holder (1/2" diameter) that is to be brazed onto a sleeve 1" long. Both the holder and the collar are to be made of 4140 25-32 HRC. Can anyone share their insight on which filler material should I use for this application? Also, first time...