Hello. Today… I made a video of the 1-inch pipe “ROOT PASS.” I’d appreciate it if you could press “Subscribe” and “Like.” Okay, this is an inch sch10 CS pipe. The steel plate thickness is 2.77 millimeters. Pipe thickness is less than 3mm I’m going to do a back bead welding with this. First of all, the gap is about 3.2 pie welds. The camera’s too old to focus on. I’ve tried this and that, but I’m still distracted. Anyway, that’s how much the gap. The pipe is 2.77mm thick, but the gap is wider than the pipe thickness I’ve created an ironic situation like this way. Anyway, the width of the gap is about 3.2 pie welds. 2.4 pie welds will be used for welding This is a 2.4-pi welding rod. I don’t think we’re going to get any space. But the gap is wider than the thickness of the pipe… It’s like this. The camera’s not getting the right focus. It’s a bit off. I’ve been filming a lot of welding, so the camera’s getting more distracted these days. The inside diameter of the nozzle is 12 mm. Tungsten is 3mm long. It’s a little short. The pipe’s small, so tungsten needs to be short, so it’s normal. Tungsten’s angle is about this much. The angle of the weld rod is this much. I’ll aim in a little bit more than the weld pool. If you look at it from the front, it looks like this. That’s how I put the pipe up. “TACK” was done at 1:00, 11:00, 6:00. You can do three “TACKs” like this. Or you can put a little longer “TACK” in two places at 12:00 and 6:00. When you’re doing a pipe fittings, Usually, we do “TACK” in four places at 12, 6, 3 and 9. But when the pipe size is this small… The supply of the welding rod becomes difficult at 3 and 9. So I avoid 3 and 9 a.m. Instead, we did “TACK” at 1:00 and 11. That’s how the nozzle moves. Like walking up the top corner of a groove… We’re going to take one step at a time. The welding rod will be supplied at this angle. Can’t you see it well? I’m going to turn the pipe a little. This is the angle of the weld rod. If you think the “TACK” part is a weld pool… Aim slightly down in the weld pool. We’re going to supply them at this angle. We’ll do a 5G weld from 6 o’clock to 12 o’clock. It’s been too long since I’ve done this difficult welding. I’d appreciate it if you’d like to take a look at it with a generous mind, even if it’s a little awkward or something or a little weird. I’ll turn the pipe back and put the “TACK” on at 1:00, 11:00, 6:00. The crater setting is “Repeat”. The current is 90 amps. The welding rod used a 2.4-pi welding rod. The welding method is… Welding current and crater current are being repeated and welded a little bit by little When I was welding that small bore pipe… I often use that kind of welding method. Because a pipe that is so thin and small in size has a very fast thermal conductivity. So we use that method to keep the temperature from rising too high. If the temperature goes up too high… Too many backbids on the top of the top of the pipe Or it could be a pleasure. The back bead at the bottom of the pipe will look relatively low To reduce the probability of that finding, we’re doing a temperature-controlled welding. And of course, if you’re good at it, you know, there’s a little bit. The current used 90 amps. This is how the crater and weld current are repeated, little by little. So, we’ve welded half of it. When I went to the other side and tried to weld it, the screen was obscured, so I turned the pipe in the opposite direction. The current used 90 amps. When we’re welding this size, 90 amps have a little higher current. The reason we got the current a little high… To ensure that the weld rod and groove are melted once welding. When you’re cutting off the welds like you are now… If the current is too low, the timing of the weld rod supply and the timing of the weld are slightly off… In some cases, the welding rod may melt less That’s why I found it in my way. It’s a little easier to weld. No, it’s not. It’s gonna be a little less difficult. But it’s not easy to weld a “small bore pipe” in a position like that position. You can see that when the welding current is generated, we supply a little bit of the welding rod. And then the crater, and then the weld, and the crater, and so on and so forth. And the other thing that matters is… The smaller the pipe, the greater the probability of the head being positioned backwards as it is welded So you should always be careful that your head position is ahead of the weld pool. Now, when we’re done with the welds, hold on to the crater. If you look over there, you can see the weld current and the crater current are repeated, and you’re welding a little bit. Even with that slow welding, the pipe is so small that the speed of the work is not significantly increased. So I think it’s important to weld it in a calm manner without rushing it. I’d like to show you a lot of detail, but since the pipe size is so small, I can’t get the camera angle. So please forgive me for not showing you a lot of things. My welding methods are not necessarily correct. But it’s a welding method that can be applied in a variety of situations, so I hope you can help. I hope this is a growing motivation for all the welders and a little bit of help. “Subscribe” and come to my channel to watch more welding videos. Thanks for watching.