BEGINNERS TIG ROOT: 1G 4 INCH PIPE

by Bob Moffatt


We're going to do a series of pipe welding videos on four inch, schedule 40. This particular one is going to be like that intro, get you started type thing. We're going to kind of roll this out. We're using a smaller V-block over here on the table. So we could go to a little bit more than quarters. I know that on the small bore two inch pipe we did it in quarters.

-This one we can actually reach a little bit lower, but again, this was to build confidence and get you started. My fit is going to be a loose 332. I'm going to use a number five cup and we're going to put roots in today. Let's get some gear on and get going. I'm going to heat the leading edge of this root up. I'm trying to keep the wire on the leading edge and down low in the groove. My personal preference here is to rest the cup gently in this groove here. I have a number five cup and I like to just do the wiggle thing when I'm doing this in quarters. That way I can come up here on top. I intend on blending into this tack up here, heating it up and pushing some wire in it and fusing it all together. So I might be slightly over the top when I get there and that's fine.


-Again, this is to build confidence, being right here in a position, where you're not in a weird, you know, you're not uncomfortable. So, you could hold the torch different. Since I said I was walking the cup in there, I could do this by resting the heal of my hand in here and free handing it. Flexing that torch. If I was to maybe get right in there. Then when I come up to a tack, I kind of like to heat everything up. Then dab some wire in there, wash back across and blend it all together. Okay, I can tell where I came off of the leading edge and I melted that. There's always a little bump in there, but then the rest of it shows the edges broken down and some reinforcement. So we're fine. That is our goal. You want a little reinforcement, want to to make sure that we're melting edges. It's not so much about forcing it in there and blowing a big keyhole and all that kind of stuff. You just kind of... That technique is, we're breaking down the edges of the pipe bevel. We're keeping the wire in there so that we can control it. That will build your confidence when you're starting to weld these and learning how.


-Another method, as I mentioned before, you know you could rest the heal of your hand against the pipe and freehand this in here. I'm going to try and demonstrate that. While I'm doing it, this is going to be more of a, work the tungsten back a little bit, small keyhole, dab the wire in there, and keep going. We'll see what happens. I'm going to heat the leading edge of my root up here. Kind of do the little keyhole dab thing. Dab. Dab. Dab. I feel like I'm shaking like a puppy pooping peach seeds here. Again, this is not my preferred method, but some of you may be real comfortable with it. Well, that looks okay, but not my preferred method, but it came out just fine. I've done this before. Sometimes you're forced to do that by position and availability to your weld. Again, my preferred method is to rest the cup in there and just take a walk. You know this one, kind of key holing and dabbing and resting my pipe on my hand, or resting the heal of my hand on the pipe. So, you know, again there's multiple ways to do this, but this'll get you started. You can relax. Do these in quarters, get confident, see your results right away. We're going to be doing more roots in multiple positions. We're also going to be filling and capping these welds. Four inch schedule 40.


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