Solid Vs Flux Core Vs Duel Sheild

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I very rarely weld mild steel. Its all ally with the occasional light wall SS.Occasionally I weld up some 125x75x10 angle to 75x100x10 angle for a cantilevered glass structural glazing channel. Theses are usually  about 2.5-3.0m long and I fully weld both sides of the weld . I know a pic would be nice... anyway they are corner fillets.I have always used solid wire ,1.0mmI have used flux core and duel shield at tech and really liked the duel shield.10 years ago I got a lot of distortion , we still get a bit , but with better  procedures it is at a quite acceptable level for the application. Particularly hitting it with an Oxy pre heat . (And post )My question is, is it possible that I will have less distortion with a flux core wire or a duel shield as the weld must cool that slight amount slower?BrettA good guess is better than a bad measurement
Reply:My experience with using an outer-shield cored wire is with 1-1/8” thick material. The main reason for choosing cored verses solid wire is the deposition rate of the filler along with the deeper penetration of the cored wire. The outer-shield wire runs superior with little spatter and smooth beads compared to solid wire. But the reason I answered your post is because my experience with cored wire on thin material happened when I ran out of solid .030” when welding 12 gauge sheet material. I had .045” Ultra Core 712C in my other machine and used it to finish the job. 12 gauge is actually within the range of the 712C .045" cored wire diameter so I set it up and ran it fast as the penetration is deeper compared to solid wire. Anyhow, the 12 g. material barely warped compared to the solid wire weld. I am not exactly sure why but it may be because I had to run hot and fast to achieve the desired weld profile so the HAZ was not as saturated as when using solid wire.I also do not know if the same is true for your situation but it may be worth a try.
Reply:Originally Posted by BrettMy question is, is it possible that I will have less distortion with a flux core wire or a duel shield as the weld must cool that slight amount slowert
Reply:Originally Posted by TensaitekiConsidering the application you probably don't have a lot of choice as far as joint design. However, you might want to look at whether it is really necessary to weld both sides. Generally, less weld means less distortion.