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Control your pre-heat and interpass temperatures. Duplex stainless steels need an interpass temp between 250°F and 300°F. The specific temperature depends on the grade of stainless and the filler metal used. Too high an interpass temp can degrade the corrosion resistance.
If you're welding pipe you need good back purge procedures. Heat tint on the inside of teh pipe root from oxidation can also compromise the corrosion resistance.
Check with Outokompu, or your metal supplier for recommendations on welding this specific alloy.
This metal doesn't weld good at all. After welding on it now for a couple days starting to get the hang of it. Really gotta control your work angle and travel speed for it to lay in the joint the way the company wants it to. the parts are for a power plant and the company is **** as **** on how it's to be done , but Inspector came in and said they are good to go.
Not sure what pulse welder power source your using.........but I weld 2205 duplex all the time at work building pressure vessels. I use a pipeworx 400 with either Tri-A or Tri-H gas......you have to set your arc control a lil high to get your puddle to flow out properly. Or you can use 98-2 O2 spray arc gas in a pinch but it looks like ****. Duplex is tricky to pulse......because the puddle isnt very defined......its kinda a mix of spray arc and globular transfer rolled into one. But once you figure it out.......it will pass RT everytime. Good luck!