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Metalworking (rec.crafts.metalworking) Discuss various aspects of working with metal, such as machining, welding, metal joining, screwing, casting, hardening/tempering, blacksmithing/forging, spinning and hammer work, sheet metal work. |
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#1
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How the heck do you weld around a circumference?
On Thu, 18 Apr 2013 07:33:02 -0700, Jon Danniken
wrote: Hello, I am working on an exercise contraption that has a number of pieces of horizontal pipe, welded on the main structure, which provide a convenient place to hang the weight plates when they are not in use. I am at the part where I have to weld the pipe sections on to the main structure. The pipe sections are five inches long, and are 1.25" schedule 80 pipe, and they will be fillet welded around the circumference where they join the main structure (the main structure is made from 2.5" square tubing). So I'm all ready to weld these on, I have the main structure laying on supports on the shop floor, and I have the first one clamped up, ready to be welded around Here's my question: how the heck to I maintain the correct rod angles as I go around the circumference? I played with a couple pieces of scrap yesterday, and while I can get my weld started just fine, when I go to move *myself* around the work, I find it nearly impossible to maintain the proper angle/distance/speed of my electrode. So how do you do it in a situation like this? Is the trick to give up on the idea of doing one continuous bead, and instead do the weld in two or three sections, so that you don't have to move your entire body while trying to weld at the same time? What's your technique? Jon The technique is that of pipe welding and you need to move your hand (holding the rod) faster than the weld is progressing so that the rod angle to the work remains constant as you weld around the pipe. Welding a pipe, at the top of the pipe the rod angle is say 15 degrees to the pipe surface but when you are half way down the side of the pipe while the rod angle reference to the work has not changed the angle of your hand holding the stinger is closer to 105 degrees and when you get to the bottom the rod is pointing backwards. -- Cheers, John B. |
#2
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How the heck do you weld around a circumference?
On 04/18/2013 05:04 PM, J.B.Slocomb wrote:
The technique is that of pipe welding and you need to move your hand (holding the rod) faster than the weld is progressing so that the rod angle to the work remains constant as you weld around the pipe. Welding a pipe, at the top of the pipe the rod angle is say 15 degrees to the pipe surface but when you are half way down the side of the pipe while the rod angle reference to the work has not changed the angle of your hand holding the stinger is closer to 105 degrees and when you get to the bottom the rod is pointing backwards. I experienced this somewhat last summer when I was welding the end of some horizontal sections of square tubing. When I transitioned between the vertical and horizontal faces, my rod holding hand had to make up a lot of distance in a fast arc, while the rod tip barely moved. I knew that I was going to be doing this going in, but it's a whole different thing when you're actually _doing_ it, as compared to just thinking about doing it. I have a lot of respect for pipe welders now; it is a very challenging job to perform this while still making an acceptable weldment, and they make it look easy! Jon |
#3
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How the heck do you weld around a circumference?
On Fri, 19 Apr 2013 14:54:57 -0700, Jon Danniken
wrote: On 04/18/2013 05:04 PM, J.B.Slocomb wrote: The technique is that of pipe welding and you need to move your hand (holding the rod) faster than the weld is progressing so that the rod angle to the work remains constant as you weld around the pipe. Welding a pipe, at the top of the pipe the rod angle is say 15 degrees to the pipe surface but when you are half way down the side of the pipe while the rod angle reference to the work has not changed the angle of your hand holding the stinger is closer to 105 degrees and when you get to the bottom the rod is pointing backwards. I experienced this somewhat last summer when I was welding the end of some horizontal sections of square tubing. When I transitioned between the vertical and horizontal faces, my rod holding hand had to make up a lot of distance in a fast arc, while the rod tip barely moved. I knew that I was going to be doing this going in, but it's a whole different thing when you're actually _doing_ it, as compared to just thinking about doing it. I have a lot of respect for pipe welders now; it is a very challenging job to perform this while still making an acceptable weldment, and they make it look easy! Jon Practice does indeed..make perfect. Gunner, still struggling with "overlapping dimes" while tigging. |
#4
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How the heck do you weld around a circumference?
On Apr 19, 3:57*pm, Gunner Asch wrote:
Gunner, still struggling with "overlapping dimes" while tigging. Just another draw back of drinking brominated vegetable oil 24/7-365 |
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