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1/16" mild steel, prepped by using knotted wire wheel. 3/32" lanth electrode, #6 cup w 15 cfh argon. ER70 filler.Played with between 50-60 amps, straight polarity. Had the coupon on some 1/2" steel as a sink. Where the coupon didn't warp and stayed against the plate, the beads looked better.Thanks,DB
Reply:Not bad for just starting out. Note that a wire brush will not remove mill scale or rust, only polish it. You need to use a sanding disk or grinding disk to get down to clean steel.1/16" is a bit thin to learn on. 14 ga or better yet 1/8" would be a better choice..No government ever voluntarily reduces itself in size. Government programs, once launched, never disappear. Actually, a government bureau is the nearest thing to eternal life we'll ever see on this earth! Ronald Reagan
Reply:Actually, when I was learning scratch start, I found it easier to get started on some seriously thicker materials. I was using 1/4 inch and 3/8 inch scrap, at about 125-140 amps, and I found it easier to lay beads and get the hang of things without the plate over heating so much. Clean with a grinder or sanding disk down to bright, shiny metal (unless it is cold rolled) and wipe clean with acetone. Every 4 or 5 beads, dunk in a bucket of water to cool. check out Jody's videos at weldingtipsandtricks.com He has a number of good videos on scratch start TIG.Miller Multimatic 255
Reply:Thanks for the input. I'll try next with thicker material and prep it better. I love Jody's videos. I did watch that one and will have to watch it again...I liked the switch he made to kill the arc without disrupting gas flow.DB
Reply:Check this one out. Jody was referring to me in this video and those are my coupons he shows at about 40 seconds into the video. Only one of the pates (on the left) was 1/8th. The two on the right are much thicker..3/8ths I think. Miller Multimatic 255
Reply:Down side of thicker steel is it fools guys into thinking they can weld, when they can't. It's easy to make nice looking welds when you just floor the machine and don't have to worry about heat. However most times the guys are no where near the amps they'd actually need to be welding material as thick as they are using. Much like mig, you make pretty welds that won't hold well. It's more important to learn to control the puddle, then "pretty" automatically follows.By working with 1/8", you are in the working range of the material for most machines, between 100-125 amps. The material is thick enough that you don't instantly melt thru if you don't do it right, but it's still thin enough to allow the use of full amps with the machine size most people use, as well as be thin enough that they still need to learn heat control. 14 ga material heat control becomes more critical, and 1/16" it becomes even more so. I'd rather guys were too hot, then too cold if I had to pick one way to be wrong. Chances of a reasonably good weld are better with more heat than less. Thin material "scares" guys and they will tend to want to weld cold to prevent burning thru. Slightly thicker material will work to combat this..No government ever voluntarily reduces itself in size. Government programs, once launched, never disappear. Actually, a government bureau is the nearest thing to eternal life we'll ever see on this earth! Ronald Reagan
Reply:Thanks again for the advice. I like the idea of sticking with thinner material.I will better prep some 1/8" and try again this weekend.Being self-diagnosed ADD (I may be the poster child!) I find myself with more irons than fire!I want to spend time working on my stick and MIG skills, too, and will probably use heavier stock for those.Have a great weekend all!DB
Reply:Attachment 907201Played a bit with some 1/8" ms. Fillet at 60 amps. Prepped with flap disc and acetone. Felt a little better and puddle seemed easier to manipulate. Attached ImagesLast edited by labparamour; 11-17-2014 at 04:47 PM.
Reply:More power! 60 amps is 1/16" material power. You want to be up closer to 100-125 amps. You just aren't getting good fusion with the base material when the amps are so low..No government ever voluntarily reduces itself in size. Government programs, once launched, never disappear. Actually, a government bureau is the nearest thing to eternal life we'll ever see on this earth! Ronald Reagan
Reply:Okay, thanks.I will bump up to what you recommend and practice with that. DB
Reply:With no pedal, go on the low side of that scale. say 110-115. It gives you some room to play a bit. It's certainly doable to tig 1/8" at 125 amps, but then you can't cool down the puddle as easily. If you are slightly cooler, say 115 amps, you just slow down a bit to get the puddle size you need, and if you need to cool down, speed up some..No government ever voluntarily reduces itself in size. Government programs, once launched, never disappear. Actually, a government bureau is the nearest thing to eternal life we'll ever see on this earth! Ronald Reagan
Reply:I really appreciate the guidance. Now I need to put in the time to see/feel the difference and better understand the relationship between all the variables..."hood time!"Gonna get more gas and filler tomorrow and practice some more.DB |
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发表于 2021-8-31 22:15:00