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I am just starting welding. I have a Hobart Handler 180 220v. I am welding 1/4" steel. When im welding a horizontal joint, I amusing a circular motion going left to right. My question is what is the best technique when welding a vertical joint of 1/4"?Last edited by bnew17; 12-23-2012 at 08:58 AM.
Reply:Learn to read the puddle. At that point "technique" is all done by what you see the puddle doing.I covered a lot of this yesterday for someone on stick. I'm a bit pressed for time this morning, so I'll copy/paste my replies. Take a look at the links as well I believe the last one covers vert up with mig. Even the stick posts are relevant, as the motions are the same. Mig is easier because it's easier to read the puddle. If this doesn't make sense, let me know and I'll work with you on this. Originally Posted by DSWCould be several things, but with no picts, I have to guess.What I think is happening is that you aren't holding the sides long enough and crossing the middle fast enough. I see this quite often at the tech school with students learning vertical up. My guess is you haven't really learned to read the puddle yet, and are trying to run "timing " patterns.Here's what is happening... In flat/ horizontal guys often swing back and forth between the two plates say on a T joint. They go up on a count of one to the top plate and down to the bottom on the count of two holding equal time on both pieces. This is fine on flat, and works Ok most of the time on horizontal. What happens when you get to vertical and try to do the same thing is that you don't get enough material at the sides, and get more material in the center. Running an even back and forth pace, you spend a count of one on the left, a count of one crossing the center, a count of one on the right, and a count of one going back to th eleft where you started. That means when you look at the whole, you spent (1) on the left, (2 1+1) going across the center, and (1) on the right. The center is either high and drippy and the sides are ok, or you get undercut on the sides and the center is even.What you need to do is vary your travel speed side to side watching the puddle fill. It's harder with stick than mig, and I often do this demo with mig so the guys can see the puddle with no slag hiding what is going on. When you move to the right, you pass the center quickly and the pause on the right side until the puddle catches up to the arc, then quickly cross the center again, and pause on the left, until the puddle catches up to the arc again, and repeat. Now if you look at how long you spend in each location, you spent (1) on the left, (1 1/2+1/2) going across the center, and (1) on the right. So everything is even.The other possibility is that you are moving "up" too much with each cycle. Lets say for every inch up you do 2 cycles. You start at 0 on the left and go up to the right to 1/4", then left to 1/2", then right to 3/4" and finally back to 1" to start over again... You either have to go slow to get the weld to fill, or you leave big gaps on the toes as you go up. Instead increase your speed of side to side and decrease the vertical movement. Now start at 0 and go right to say 1/16", then left to 1/8" and back right to 3/16" and so on. This tightens up your movements and lets you travel "faster" laying down material in a "thinner" layer that's more even.A few vertical stick threads to look over.http://weldingweb.com/vbb/showthread.php?t=61066http://weldingweb.com/vbb/showthread.php?t=26875Here's the thread I was looking for where I explained some of these issues with Vertical. Look at posts 18 and 19 and see if this makes sense.http://weldingweb.com/vbb/showthread.php?p=1337671
Reply:Pretty vague question. What type size and size wire? what joint prep? ???
Reply:Thanks for the info DSW. It is very helpful. LHDMeCH I am using .035 hobart flux core wire and the joint is a corner joint
Reply:All the stick stuff will be relevant because you are running FC. One big thing is to be sure you can differentiate what is slag and what is molten metal.Post up picts of the welds and we'll help you out with 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 |
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发表于 2021-8-31 23:39:04