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MIG help please

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发表于 2021-9-1 00:19:53 | 显示全部楼层 |阅读模式
Hi allWhen trying to do a vertical weld into an angle, the weld ends up with a very high bead, rather that sitting flat into the angle.Sorry the pictures aren't too good, but they show what I mean I hope!I welded starting at the bottom of the joint, moving up, when I try starting from the top going down, the weld seems to just run down, leaving large blobs/drips of weld on the joint.The material is mild steel, about 3mm thickness, I am using 1mm wire. Not sure what current I am using, I think it was about power setting 5 out of 7, on a 220A welder.When I was setting the welder, I use a piece of scrap material, about 3mm thick, and set the current as high as possible without burning a hole, then set the wire feed so I get nice frying bacon sort of sound. The welds I made on the scrap came out perfect, but I was welding flat on the scrap, not vertically like on the actual job.Couple of questions........When I set the weld on the scrap, I am only making a weld on a single piece of metal, the job is welding 2 pieces together, do I need more current?Do I need different settings for welding vertically, rather than welding flat?Help!!Thanks for all replies.
Reply:SimonJ,You're attempting one of the more difficult tasks, vertical up. By the looks you're also using solid wire and gas??  Another difficulty factor. Also looks like yourwelding on something in the auto/truck frame group or similar?? Maybe a shock tower?? If so it needs to be done right. Number one is clean up the metal as best you can. You need every advantage as well as little spluttering and rejection as possible. Turn your heat down a little from the flat/horizontal position. Get yourself some kind of a side to side action going with that you'll not only be keeping the actual size of the molten puddle reduced somewhat you are also building a tiny saddle for it to set on as you go up, back and forth.There were a lot of comments here on vertical up in the last two or three months. One gentleman by the title of Malich kept at it till he came up with a pretty darn good looking result. One of the better. Do a search for the words/phrases vertical up or even under his title and I think you'll get quite a bit.
Reply:Looks like a cold weld to me with no penetration and now weave.There are a couple of things that will help.  I don't see any evidence of weld preparation, which should've been done beforehand.  Following that, try doing vertical down, with a bit of a weave.  Keep the arc out of the puddle and pause on either side of the weave as you're going down.  Watch the puddle very closely to see what it's doing.
Reply:Thanks for the replies.I can see I need to get a little more practice in!As for the weld prep, i took the frame back to shiny metal for a large area around where I was welding the mount on, and on the mount, i took it back to shiny metal for about 3/4" from the edge I was welding, is this good enough prep? (on the top picture, the frame is on the right, and the mount on the left)What is the best technique for weave?As far as this joint goes, what is the best way to repair it, do I need to grind it out and start fresh, or can I weld over it to make a strong joint? It is an engine mount to a chassis frame, so needs to be pretty strong (I have hit it pretty hard with a sledgehammer, and it doesn't move, so maybe it is strong enough anyway?). I will be striping the chassis before it goes for paint, so will be able to hang it in any position to weld, maybe I will get a better weld if I do it flat?Thanks for the help so far guys, keep it coming!
Reply:I will be striping the chassis before it goes for paint, so will be able to hang it in any position to weld, maybe I will get a better weld if I do it flat?
Reply:turn your voltage and wfs down
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