Thin pipe welding process Hello. Today I made a video about the thin pipe welding process I’d appreciate it if you could press “subscribe” and “Like.” This is a thin pipe. Applicable to “sanitary pipes” and “structural pipes”. These pipes are usually used in food, pharmaceutical manufacturing, and vacuum lines in semiconductor factories. I’m going to do this welding today. First of all, the size of the pipe is about 89mm in diameter Often the schedule pipes we use read the internal diameter. However, it is common to read the external diameter of a sanitary pipe. And these sanitary pipes are thin. It’s usually about 1.5mm thick or 2.0mm thick. Of course, there are thinner pipes. This pipe is about 2mm thick. Can you see? The pipe is thin like this. Normally, when we weld a pipe, we create a gap between the pipes like this, and then we weld it between them. However, it is common to weld sanitary pipes closely without gaps. As with other welds, sanitary pipe welding is largely divided into two different welds. One way is to weld the penetration thinner than the pipe thickness. Another way is to weld the entire pipe thickness. Sanitary pipe welding is common without the use of a welding rod. Sometimes we use a thin welder. Welding rods are sometimes used when there is a gap between pipes And when you do “Tack,” you do this small size of welding. “Tack” is very small. The penetration is thin. If you look inside the pipe, it’s a little bit charred, but it’s not oxidized. And as you can see, we did “Tack” instead of “PURGE” inside the pipe. Now, if you cut the pipe, you see this shape. The penetration is shallow. With this weld, you can “tack” the pipe without having to “PURGE GAS”. However, since “PURGE” is not used, if penetration depth is deep, the inside of the pipe may be oxidized, so please be aware of this. Sanitary pipes have many different welding methods. In a common way… There is a way to weld the nozzle by rolling it from side to side. And there’s a way to drill the torch and weld it straight. And you can press and float the button and weld it with a point-blank welding method. Or it can be welded with a pulse welding method. There are many ways. And I’m going to make this kind of video later Today, we’re gonna roll the nozzles from side to side and weld them. The spacing and width of the weld will be very small and narrow. The inside diameter of the nozzle is 16mm. It’s a big nozzles number 10. It’s about eight millimeters long. I’ll do the welding without using the welding rod. And if you look here, it’s a little bit smaller. This could break the “Tack” during welding, so we’ve done a lot of welding. This makes the “Tack” smaller but stronger. I’ll do the welding like this way The current used 45 amps. We used argon gas about 20. “PURGE GAS” used argon gas. “PURGE GAS” usage is about five. When welding thin pipes, such as sanitary pipes, the most important thing is to feel the depth of penetration. For thin sheet metal welding, it is also detailed in “Tig Welded BASIC Part 2”. If you use too much current to weld a sanitary pipe, you will be able to penetrate the inside of the pipe. But on the outside of the pipe, you will experience the oxidation of the surface of the pipe due to the high amount of heat input. So if you use a current that’s too low to prevent oxidation on the surface of the pipe, you can prevent oxidation on the outside of the pipe. However, the penetration may be low and not be welded to the inside of the pipe I’m sure some of you have a hard time welding sanitary pipes because of these problems. But if you’re using a low current to feel the penetration of the weld, it’s an easy weld. Now I’m using low current to make the weld safe, and the weld is moving very close and close together to make it safe. However, the disadvantage of this weld is that the weld speed is slow. But I’m just showing you this because it’s safe. If you succeed in this way in sanitary pipe welding, you can achieve faster and faster welding speeds by using higher current and increasing bead spacing. In conclusion, it is important to look for intermediate steps where penetration penetrates the pipe and the surface does not oxidize. The area where the weld started may have a low penetration. So when the weld is finished, it’s safe to do a little more welding on the connection. I need you to hold the crater at the end. So here’s the result. I don’t think the outside of the pipe is bad. I’ll show you the inside of the pipe. I don’t think it’s bad inside the pipe. The reason why I’m making a video of myself welding on a turntable is because… If you do this, you can see the weld pool well. That’s why we filmed it at the turntable. There are a number of other welding methods besides this one I’ll make a video of it later. And we’ll be welding in another position. So today we’ve made a video about the sanitary pipe welding process. My welding method is not necessarily the answer. But it’s one of the different welding methods that can be applied in a variety of situations, so I hope it helps. I hope this video will be a growth motivation for all the welders and a little bit of help Please press “Like.” If you “subscribe” and come to my channel, there’s a lot more welding videos. Thanks for watching.