multi run attempt 80

[davidjohnperry]

Hey guys I thought I would post this up I very rarely mig weled till three weeks ago I would prefer tig or stick but cant be fussy any more and ive never done multi runs till now what u guys think
Many thanks
Dave

 

[Liquid Metal]

Only thing i would suggest would be to overlap the runs a little more, so you dont get the ridge between the two cap passes (if that makes sense)

 

[Richard.]

^^^^ yep the fusion between the two top runs could of been a little closer particularly on the right side. Left looks really good.

 

[backpurge]

As above, each run needs to overlap the run below by about 50%. It's basically a matter of pointing the torch in the right place, and then getting your angles and travel speed right

 

[Bede]

It works much better with a higher power / lower wire feed for the capping runs. You want flat welds, not bulging beads but you're on the way.

 

[Bede]

Sorry, wrong photo!

 

[Bede]

This shows the structure of building multi-runs pretty well.

 

[backpurge]

Excellent photo to illustrate

 

[Bede]

The pipe flange is a three-run 10mm fillet and the lifting bracket is seven runs. Can't remember what size fillet I built that to but it was a 20 tonne lifting bracket.

 

[Bede]

I always also stagger the start / ends of runs where possible on long runs to eliminate potential weaknesses.

 

[short circuit]

I always also stagger the start / ends of runs where possible on long runs to eliminate potential weaknesses.

for how long the narrow (width) of the plate is i would have started on the end welded continusly around the corner and across the face in one this way instead of 4 stop starts you have 2 to blend in and as you stated stagger your starts so the next run around would start/stop on the opporsite corners. this will also reduce the dropp off at the weld ends

 

[Bede]

The plate is something like 300 x 50 thick, from memory. I'm not at all a fan of welding around corners. It obviously flew MPI! I eliminate drop off at weld ends by overlapping starts.

 

[davidjohnperry]

since passing my coding for a 12mm fillet weld i have not done one yet but im sure ill have to do one sooner or later ill post a pic up