Hello This video is MIG root pass & 7018 stick welding image Please take a good look and if this video is helpful, I would appreciate your subscription and good press. The welder I use in the video is a Miller product. There are various modes of welding mode, but we will weld in the mode called RMD. RMD welding is very similar to MIG welding. Welded products are 6-inch standard carbon steel pipe. The electricity used was a volts of 0.7, a wire speed of 230, and a roll wire size of 0.9 mm (0.035 inch). The gas used was a mixed gas of argon (Ar 75%) and Co2 (25%) Usually, the root gap of the MIG welding is about 4 mm, but the pipe gap in the image is very narrow, about 2.6 mm Almost all the keyhole welding was done. MIG welding is not so difficult if you know only a few things to watch out for and characteristics. The advantage of MIG welding is not difficult welding, and if you have some welding experience it will be easy to learn. Welding speed is also faster than other welding and welding is very good. There is a merit in that the amount of heat input during welding is small so that it does not easily deform after welding. Weldability is also very good when wide gap welding is used. The disadvantage is that the welder itself is large and heavy, making it difficult to carry easily, and the holders are also short and heavy Workability is poor for welding while moving. In addition, it is considered that narrow gap welding is almost impossible because the weldability is very bad in narrow gap welding. Because the holder is heavy in position welding and it is automatic feeding method, it is necessary to precisely adjust the current and voltage, and fine control is required along with weaving I think there is nothing wrong with this if you are only a little proficient. So far, we’ve looked at the advantages and disadvantages of MIG welding. Now, I will explain the parts of the welding that I need to be careful about in detail. Since MIG welding almost always causes pinholes at the welding stops, you must remove the pinholes with a grinder and then start welding. MIG welding is very vulnerable to narrow gaps The narrower the gap, the longer the welding time and the harder it becomes. The beads will not be made smooth. Above all, welding difficulty increases.
Increases the chance of an RT repair. If the root gap is narrow, welding failure and welding failure frequently occur, especially at the beginning and end of welding The chance of getting IP or LF repair is greatly increased. If you do not have enough experience, we recommend that you secure enough gap if you are not confident in keyhole welding. I think that there is no big problem if you only know this way of MIG welding. Next, we will learn about stick welding, fiill up and capping welding. This time stick welding. I used a 5mm welding rod. Electricity used 265 amp. If you have a serious arc blow as in the video, it would be very helpful if you only set the angle of the welding rod. If the arc blow is severe, there are a few ways In my case, lower the electricity or use one small step to remove the arc blow. Backstep is really important at the start of stick welding. The stick welding is surprisingly better than the slag-mixed repair. So it is best to make sure the backstep is clear. Now we’re in the final capping area. When final capping is done, the position of the electrode is not at 12 o’clock You can make a better bead by welding with a little hand feel. The angle of the welding rod is about 15 degrees to 25 degrees. Now ~ welding is almost finished. So we finished 6 “standard carbon steel pipe welding. The time spent from the root pass to the final capping took about 20 minutes. If you liked the video, please click OK and Subscribe. Thank you for watching.