slipon Flange welding

[sdomermpc]

I want to write a preliminary wps for flange (MS thickness 20mm) to a pipe ( MS thickness 8mm), i was referring to D10.12M/D10.12:2000, Guide for Welding Mild Steel Pipe. but there is no information on fillet weld. Do we have to run tensile and bend test on test coupon?

 

[GenB]

If you already have plate or pipe procedure for the material and thickness you will not need more tests. That's per ASME sect IX.
But writing a procedure is not easy if you do not have any experience, I suggest you look for advise. If Code work your inspector can help you. Also look for AWS standard welding specifications.

 

[sdomermpc]

can someone share a sample wps pqr for this fillet weld?

 

[sdomermpc]

we will be using smaw,or can someone point out swps

 

[david339933]

As GenB stated, if you currently have a WPS for SMAW, this will work for your situation. Whether it was qualified on plate or pipe for the PQR does not matter, either will qualify ALL fillet sizes on ALL base metal thicknesses and ALL diameters. See QW-451.4 Rarely would there be a special procedure for this type of weld.

 

[sdomermpc]

unfortunately we dont have wps for groove weld or any.we're just going to make fillet weld on pipe n flanges. I know that butt weld need to have minimum tensile strength of base metal, what is criteria for fillet weld alone to qualify? what should be the size of throat, how can we make sure that we have that exact size in our weld, does that depend on electrode we're going to use? and which is better for this weld smaw or gmaw?

 

[Duwe6]

With GMAW there is a *large* risk of Lack-of-Fusion between the weld beads. Thus IMHO, SMAW is the best choice of the two. Other good choices are GTAW, and on larger flanges FCAW.

Weld size is per Code, so what Code are you using? Typically, the throat of the fillet has to equal or exceed the wall thickness of the pipe, making the filletweld leg size 1.4 times wall thickness [square root of 2; 45° right triangle]. Thus the amount of weld on a heavy-wall flange is huge; 3/4" minimum on an 8"NPS Sch80/XS pipe. Thus the preference for weld-neck flanges.

 

[sdomermpc]

@duwe16 what about qualifying fillet weld? how to select a smaw electrode for this weld?