Hello, today… I made a video about the “SCM440” welding. I’d appreciate it if you could press “SUBSCRIBE” and “LIKE.” This is a material called “SCM440.” It’s a high hardness of iron. It’s very hard. The commonly known hard iron has an “SM45C.” It’s harder than “SM45C.” But the reason I brought this is because… This is what happens when you weld this thing. There is a crack in the weld area. So I looked up the data for welding SCM440 But there’s no WPS. The search did not find the exact method of welding to weld the “SCM440” Of course I may not have found it. But we found a few guesses. Welding produces crack. be out of welding Or maybe this is how it works. There’s just a guess, “Isn’t that enough?” If you have accurate information on SCM440, I’d appreciate it if you could give me a link. And that’s why I’m making a video. So, how did you do this? I’ve welded some guesses and my feelings together. So, you know, it’s normal to use it. When there’s no trouble, Maybe it’s the world’s first “SCM440 weld. If you look here… I dug a groove to deepen the penetration. After welding this part, This is how the two sides are machined. Of course, we’ll do some heat treatment later on. After this process, you’ll get the exact result. I can’t see the detail even if I’m shooting from close proximity. Welding rod used “ER80S-B2” The welding rod is 2 pies. The nozzle has an internal diameter of 16mm. The tungsten is 11 millimeters long. This is how we’re going to get started. First, I put it on the turntable. Basically preheating is required before welding high hardness and thick steel. So I pre-arranged it. I slowly warmed it up over a low heat. Because the ring is relatively thin, we’ve preheated it from far away. I preheated it from the top, and it came down. I’ve warmed it up for about three minutes in this way. The warm part was burned. I cleaned it with a wire brush. If you don’t clean up, you get a lot of undercuts. Cleaning up like that will improve the weldability a little bit. So I cleaned the surface. And the rest of the debris flew to high-pressure oxygen. The color of the parent metal is different from the first one. Can you see the water vapor? I’ve preheated it to that temperature. After welding, the temperature of the weld and the parent metal can be similar. Now, let’s do the speed book on the turntable. This is how we’re going to weld it. Welding was carried out with a total of 2PASS. One PASS is to be welded with as much penetration as possible to the 2PASS will fill undercuts or underweights and finish. On the first weld, we aim the end of the weld rod as low as we can. We’ve got a lot of welding rod supply, so we’ve got a groove on it. The preheating temperature is not just the current temperature. We’ve worked on a total of 60 pieces. I did it at a lower temperature than it is now, and I did it at a higher temperature. We’ve tested it at several different temperatures. After the first weld like that, we cut the weld off and then we started again started again The reason is to find the end of the weld easily. In the secondary weld, we did a little bit of a feed on the weld rod. So I filled in the gaps in the first weld. Now, at the end, hold the crater. The nozzle has an internal diameter of 16mm. Welding rod used “ER80S-B2” The welding rod is 2 pies. The current used 170 amperes. I’ve been working on these things. And when it’s processed, we’ll have an accurate result. After this, we expect to see some changes in the composition and hardness. The problems of doing this, And the result of different preheating temperatures. We’ll also show you additional comments and comments when we’re done processing This clip was made to leave data for people who are embarrassed because they don’t have any data in case of such an embarrassing situation. I hope it’s a good source for many of My welding method is not necessarily correct. However, it is one of the various welding methods that can be applied in various situations, so I hope it will help. I hope this video will help all welders grow and help them a little bit. And “SUBSCRIBE,” “LIKE” and “SHARE” are the main forces that I’m going to make better videos. Thanks for watching.