weldinguide.com

all about welding





Welders' alternation for half circumference welding

Welders' alternation for half circumference welding

Postby mohd » Thu Oct 24, 2013 7:34 pm

Dear sir,
code: ASME IX.
On site welders qualified to weld up to 20 mm (SMAW E6010+E7018H4R).

Can we weld a pipe with thickness 27 mm and diameter 30" by dividing the pipe into two half circumference segments A & B and weld as described below:

welder-1: welding of segment A root and hot pass in total 7 mm.
welder-2: welding of segment B root and hot pass in total 7 mm.
After alternate them
welder-1: welding of segment B fill and cap in total 20 mm.
welder-2: welding of segment A fill and cap in total 20 mm.

So at any segment each welder will not have welded more than its qualification (20 mm).

regards,
mohd.
mohd
 
Posts: 74
Joined: Mon Jul 08, 2013 2:17 pm

Re: Welders' alternation for half circumference welding

Postby Ballbearing » Fri Oct 25, 2013 12:26 pm

Mohd,
No.
You mention welders are qualified to 20 mm - is that deposited weld metal thickness?
E 6010 is F3 and E 7018 is F4 so their qualifications should list thicknesses qualified for each F number - see QW 452.1 (b) Note 1.

Even if you use your theory of welding different segments it still won't work - the code only recognises a joint and how much deposited weld metal has been placed in that particular joint.
Take away my comments on F3/F4 above and pretend it is all F4 welding (E 7018) - the welders have still welded a root/hot (7 mm) and a fill/cap (20 mm) which totals 27 mm in that particular joint - irrespective of what segment they have welded.
Regards,
BB
Ballbearing
 
Posts: 76
Joined: Wed Jun 12, 2013 10:11 pm

Re: Welders' alternation for half circumference welding

Postby Logosweld » Wed Apr 23, 2014 5:33 pm

mohd wrote:Dear sir,
code: ASME IX.
On site welders qualified to weld up to 20 mm (SMAW E6010+E7018H4R).

Can we weld a pipe with thickness 27 mm and diameter 30" by dividing the pipe into two half circumference segments A & B and weld as described below:

welder-1: welding of segment A root and hot pass in total 7 mm.
welder-2: welding of segment B root and hot pass in total 7 mm.
After alternate them
welder-1: welding of segment B fill and cap in total 20 mm.
welder-2: welding of segment A fill and cap in total 20 mm.

So at any segment each welder will not have welded more than its qualification (20 mm).

regards,
mohd.


oh that's nice post for half circumference welding
Logosweld
 
Posts: 82
Joined: Thu Mar 13, 2014 10:27 am
Location: India


Return to Piping welding

Who is online

Users browsing this forum: No registered users and 1 guest