30 Sep 2021
Regarding welding technology, it must be said that the welds. Then we must first understand what a weld is? Welding seam is a seam formed by melting and connecting the welding rod and the metal at the joint by using the high temperature of the welding heat source. After the weld metal is cooled, the two weldments are connected into a whole.
According to the shape of the weld metal and the position of the weldment, there are five types of welds. The first type of butt weld is a weld between the groove surface of the weldment or between the groove surface of one part and the surface of another part. The second type of fillet weld is a weld that is welded along the intersection of two orthogonal or nearly orthogonal parts. The third type of end weld is the weld formed by the end joint. In the fourth type of plug weld, two parts are overlapped, one of which has a round hole, and the weld formed by welding two plates in the round hole is not plug welded if there is only a constant weld angle in the hole. In the fifth type of slot weld, the two plates are overlapped, one of which has a long hole, and the weld of the two plates is welded in the long hole. The fillet weld is not slot welding.
The effect of the weld can be judged by the skill of a welder. The most basic welding requirement for a welder is no cracks, slag inclusions, undercuts, pores, and weld bead. The welding surface of an excellent welder is smooth and regular ripples, fish scales, and uniform width. If you are an electric welder of a welding machine, you are proud to be able to weld beautiful fish-scale welds. Fish scale welding means that you are a very good welding worker. It does not mean how many years of welding experience you have, but you must be a handy welder who loves welding work.
Fish-scale welding is a process method of welding. The main thing is to select the welding point, turn on the power, and strike the arc with the tip of the welding rod to melt the flux in the welding rod, and then swing the welding tongs in a small range to make the welding core evenly melt in the welding position. Generally, the welding effect will be like The fish scales are the same, so it is called fish scale welding. Fish scale welding is considered to be the most advanced welding technology in the world.
Is it really that difficult to weld perfect fish-scale welds? Actually not, as long as you master the method, there is no problem at all. The first point is to choose a suitable current, which should be set according to the different materials. The current is very important. If the current is low, it will not ignite, and the welding rod will easily stick to the weldment and the welding will not be firm. When the current is large, it is easy to burn through, the weldment will be deformed, and the molten iron will flow downwards during welding. The second point is to pay attention to controlling the welding angle. The electrode should be welded forward slowly at a 45-degree angle, and the electrode should be slowly oscillating back and forth. Be careful not to be too fast, but to have regularity. The third point is to pay attention to the swing method of the electrode. Generally, the swing method of the electrode for flat butt welding has zigzag, crescent, triangle, ring and figure eight. Finally, pay attention to the technique in the welding process. When the first molten pool appears after the arc is started, the arc should be raised relatively quickly. When you see the molten pool instantly cool down to a dark red spot, lower the arc to the arc crater, and make the drop to overlap with the previous molten pool by 2/3 when it falls, and then the arc is raised, so that the rhythmic repeat action. After mastering the above-mentioned operation skills, fish-scale welds are easy.
As the saying goes: Practice makes perfect. If you master the skills and practice frequently, you will definitely get what you want. Learn how to weld beautiful fish-scale welds, and you will become an admirable excellent welder!
Keywords: welding machine
Originally published 30 Sep 2021, updated 30 Sep 2021.