Who qualified to do Tack Welding?
Who qualified to do Tack Welding?
(OP)
Hi_experts
Can anyone explain who can do tack welding in production? I am working in pressure vessel Fabrication. I have an argue with client and show ASME VIII UW.31 C, My interpretation are for permanen welder must be do with welder qualified with asme IX but for non permanen weld can do by anyone(like fitter) but using same procedure (WPS). am I correct ? Please help
Can anyone explain who can do tack welding in production? I am working in pressure vessel Fabrication. I have an argue with client and show ASME VIII UW.31 C, My interpretation are for permanen welder must be do with welder qualified with asme IX but for non permanen weld can do by anyone(like fitter) but using same procedure (WPS). am I correct ? Please help





RE: Who qualified to do Tack Welding?
Tack welds, whether removed or left in place, shall be made
using a fillet weld or butt weld procedure qualified in
accordance with Section IX. Tack welds to be left in place
shall be made by welders qualified in accordance with
Section IX, and shall be examined visually for defects, and
if found to be defective shall be removed.
The procedure and welder must be qualified.
RE: Who qualified to do Tack Welding?
"Tack welds to be left in place shall be made by welders qualified in accordance with
Section IX"
What if the tack welds are not left in place - eg temporary attachments, tacks removed prior to welding etc ?
I agree the tack welds must be in accordance with a qualified WPS - regardless of whether they are removed or not.
However, based on UW 31 (c)temporary (or as WE17 calls them - non-permanent) tacks do not require a qualified welder (IMHO),
Regards,
DD
RE: Who qualified to do Tack Welding?
Regardsless of Code requirements, I think it shouldn't matter if it's a temp or non-temp. tack; it should be your company's standard practice (by means of e.g your quality system) to only have qualified at work on Code stuff.
RE: Who qualified to do Tack Welding?
RE: Who qualified to do Tack Welding?
RE: Who qualified to do Tack Welding?
RE: Who qualified to do Tack Welding?
Thankyou very much for the response it is very helpfull
RE: Who qualified to do Tack Welding?
In my part of the world, tacks right in the root are pretty much "verboten" and we use "bridge Tacks" instead. These tacks are done such they bridge across the gap without affecting the root.
Eg: a 6" Sch 80 pipe - 3/32" root opening. Using a gap rod of 3/32" a fitter who can weld or a just a regular journeyman then takes a 3/16 or 1/4" electrode (7018 with the flux knocked off), bends a 1-2" pce of that 3/16" rod in a vice and places it in the groove but not into the root. He then tacks either side using 7018 for about 1/2" to "tack" that section of the pipe. He then bends/breaks the remaining pce of tack rod off and goes to the next tack. Very very common up here in Alberta. This also serves to reduce the amount of root pass tie-ins a welder has to do on a weld as well.
hmm, should do a short video on that and put it up on U-tube..lol
RE: Who qualified to do Tack Welding?
RE: Who qualified to do Tack Welding?
I took a look on u-tube..nothing there. When I get a chance, I'll post one up and link it here.
rgds,
stk
RE: Who qualified to do Tack Welding?
interesting comments. im in australia and we only use welders for bridge tacking or pipefitters who have been tested - usually with a 2,3,4f plate. this is always a client spec and is normal practice.