tig welding on flat bar....help
Tue, 31 Aug 2021 14:56:45 GMT
Hey guys,my name is Anthony and im new to the forum. I have a lot of experience (self taught) with mig welding. I started messing around and making belt buckles using my Lincoln mig welder. I was welding stainless using tri-mix and ss mig wire. I decided I wanted to get cleaner welds so I got myself a TIG welder having never done that type of welding. so here is my issue....when I start to lay my beads for practice on a piece of un-prepped stainless they lay out great for me. (again im laying a bead on a piece of 24'' flat bar) but when I go to lay a bead on the buckle, aprox size 2'' x 3'', im getting too hot and getting a nasty grey weld. in some cases I even was melting the sides of my buckle. now im welding on the same flat bar, just my buckle has been ground a bit and cleaned. I am welding at on 60amps with a #6 cup. my buckle is glowing red hot after I lay a bead, but when I lay a practice bead on the flat bar I am not getting red hot at all. the buckle is only 1/8'' thick. any suggestions from pros?-Anthony
Reply:First, ya gotta define "buckle" for me Is this Lap, Inside corner, Outside corner, or Butt?Next, 60A for 1/8 sounds low to me.When you're doing bead-on-plate (your FB) and it's not showing color, is it laying flat on a metal table (drawing-off much of the heat)?And Finally,,, Nothing beats a picture.....
Reply:here is a picture of what im trying to make.....obviously different designs....but here is an example of a belt buckle (bead on plate)
Reply:What's a buckle?Torchmate 2x2 CNC with Flashcut CNC controlsHypertherm Powermax45 Esab ET220i Razorweld 195 MigRazorweld 200ac/dc TigTormach 770, Tormach xstechRazorweld, Vipercut/Vipermig, SSC Foot Pedal Dealer
Reply:this is 2.5'' diameter
Reply:The small piece of stainless saturates with heat really quickly. By using low amperage you are welding slower than normal and adding even more heat. Try 100-115 amps on the small piece of stainless and weld fast to reduce heat. Clamping a piece of aluminum to the stainless will help pull heat away.Airco Ac/Dc 300 HeliwelderMillerMatic 200 (stolen)Miller Maxstar 150STLMiller AEAD200LE (welding and generating power) Hobart MIG
Reply:thank you very much! ill try that tonight
Reply:I get it, chicken toe!
Reply:Another possible issue, which is common with beginning TIG welders, is arc length. You need to keep the tip of the tungsten as close to the work as possible without touching, preferably less than 1/8". Holding too long a gap increases the heat of the arc while spreading the heat out. The shorter the gap, the more the heat is concentrated where it is needed.Also, looking at your example picture, that's a lot of weld in a fairly small area. All that heat has to go somewhere. The heatsinking that Squirmy described above is very important, otherwise you will have to weld for a short distance and then pause to let the metal cool.One other point, what size tungsten and filler metal are you using?JohnA few weldersA lot of hammersA whole lot of C-clamps
Reply:For the small stuff make sure you have a nice sharp point on your tungsten as well
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