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welding moment connections

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  • welding moment connections

    when welding moment connections with backing plate on 3/8"x8" thick I beams in the overhead position, after you lay your root pass, whats the best way to fill the joint to pass a ultrasonic inspection. running multiple stringer passes or larger weaving welds? maybe some of you structural welders can give me some pointers

  • #2
    In the overhead position, I would run stringers. I would also make the backing plates little longer than the flange, as a start & stop tab. Also if they will allow I would notch the web, run the backing plates for the flanges through the web.

    Here is a picture of how I spliced the span beam to my bridge crane.
    And of the crane
    Attached Files

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    • #3
      If its in a groove you could do either stringers or weave but I like a weave I can make nice and flat.

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      • #4
        I did the ironwork thing for a little bit, and the 7018 overhead was all stringers. This was not an option for us, it was good proper stringers with no undercut or go home. I suspect the risk might be slag entrapment with the 7018, but it was never spelled out why, maybe the foreman didn't know himself, never saw him pick up a stinger on the job, only a can of beer.
        Coalsmoke's Website

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        • #5
          When doing this "on the job" it will typically call out stringers or weave in the welding procedure....giving you no choice. On many jobs, the welders never see the procedure and are just told "that's how we do it on this job."

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          • #6
            Originally posted by Sberry View Post
            but I like a weave I can make nice and flat.
            Clearing up some terminology.

            Cary is this what you call / consider a weave?

            If so how far can you carry this in the overhead position, say with some 5/32-inch 7018?

            In my opinion a weave would be somewhere around 6 to 8 Xs the diameter of the rod. So 6 Xs .15625 = .9375 or 15/16-inch. You can carry a 15/16-inch wide weave weld overhead for how far?
            Attached Files

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            • #7
              Till the rod runs out.

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              • #8
                Originally posted by Sberry View Post
                Till the rod runs out.
                Well you da man!

                Care to post some pictures? I know we can trust you!
                Im sure Peaches would like to learn this trick!

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                • #9
                  Originally posted by Pile Buck View Post
                  Well you da man!

                  Care to post some pictures? I know we can trust you!
                  Im sure Peaches would like to learn this trick!
                  here's my take on it, if you are carrying a well formed weave, almost 1" wide, in the overhead shot you're running too cold. In all positions except vertical up, you really shouldn't be weaving 5/32" much larger than 1/2" anyways.
                  Coalsmoke's Website

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                  • #10
                    Yes, eventually I will post some pics, I dont have big welds here, most of our stuff is so light but when I was in the trades like you we weld big groves all the time. What is a 4 G plate or pipe? A young guy like Coalsmoke should post some big ole plates.

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                    • #11
                      here are some old paint covered ones coming around a pipe on something I build 15 yrs ago before I have a feeder in the shop. I actually dug a chunk of steel out the other day to do some coupons, when I get some done I will post them.
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                      • #12
                        Originally posted by Coalsmoke View Post
                        here's my take on it, if you are carrying a well formed weave, almost 1" wide, in the overhead shot you're running too cold. In all positions except vertical up, you really shouldn't be weaving 5/32" much larger than 1/2" anyways.
                        In the late 1970s I got stuck making 1 7/8-inch fillet weld overhead, welding a 4-inch x 6-inch flatbar ring to 3/4-inch thick tank. The spec called for 3/16-inch 7018. No big deal really, but if you lost the puddle, man did you ever get bombarded with molten metal!

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                        • #13
                          Originally posted by Sberry View Post
                          here are some old paint covered ones coming around a pipe
                          Whoa, Whoa! Pipe is a whole nother issue. Unless youre talking 20-feet in dia. Im talking across a 12-inch wide flange, where the heat can build and build!

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                          • #14
                            Originally posted by Sberry View Post
                            Yes, eventually I will post some pics, I dont have big welds here, most of our stuff is so light but when I was in the trades like you we weld big groves all the time. What is a 4 G plate or pipe? A young guy like Coalsmoke should post some big ole plates.
                            4G is overhead, is that what you're asking? The last thing I was worrying about when I was hanging thin iron was to start taking pictures. Foreman would have probably shot me even if I tried
                            Coalsmoke's Website

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                            • #15
                              Originally posted by Pile Buck View Post
                              In the late 1970s I got stuck making 1 7/8-inch fillet weld overhead, welding a 4-inch x 6-inch flatbar ring to 3/4-inch thick tank. The spec called for 3/16-inch 7018. No big deal really, but if you lost the puddle, man did you ever get bombarded with molten metal!
                              See, I wouldn't have tried to weave that, I would have gone good old stringers hot and quick. I would be surprised if the specs specified that it had to be a weave, or that a weave was permissable but there are things I don't know
                              Coalsmoke's Website

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