Weld bevel preparation
Weld bevel preparation
(OP)
Dear all,
I have many 56" diameter, 5/8" thick carbon steel ducts to be welded together(girth seam). Does it make any difference of using 60 degree weld bevel preparation instead of commonly seen 75 degree ?
I have many 56" diameter, 5/8" thick carbon steel ducts to be welded together(girth seam). Does it make any difference of using 60 degree weld bevel preparation instead of commonly seen 75 degree ?





RE: Weld bevel preparation
But, if for some reason, you're not required to follow any specific weld specification, I would do the 60 degree bevel, just to decrease the weld time, by way of reducing amount of filler.
RE: Weld bevel preparation
The conventional thick-wall weld prep also allows a double bevel (a 1/16 square land, a 37.5 bevel (to yield the 75 degree total prep on both sides) in the middle of the joint, and a tighter 45 or 50 degree bevel towards the outside wall. But, this requires a way to cut the double bevel quickly without thousands of inches of hand-grinding. Some pipe-prep attachments can provide this. They clamp a portable grinder/mill to the end of the pipe, then the tech runs the pipe prep machine around the joint to make the prep.
On a practical/technical basis, you only need a weld prep to provide access to the bottom of the root for the welder, and to "clean up" the original metal for the weld so you have a good fit with clean, weldablew metal exposed. .