Common techniques for stainless steel welding in stainless steel reforming and rolling

there are three most commonly used welding methods for stainless steel: manual welding (mma), metal arc welding (mig/mag), and tungsten inert gas welding (tig). while these welding methods are familiar to most people in the stainless steel industry, we feel this area deserves a closer look.

1. manual welding (mma): manual welding is a very common and easy-to-use welding method. the length of the arc is adjusted by human hands and is determined by the size of the gap between the welding rod and the workpiece. at the same time, when used as an arc carrier, the welding rod is also a weld-filling material. this welding method is very simple and can be used to weld almost all materials. for outdoor use, it has good adaptability, even when used underwater. most welding machines can weld with tig. in electrode welding, the arc length is determined by the human hand: when you change the gap between the electrode and the workpiece, you also change the length of the arc. in most cases, welding uses direct current, and the electrode serves as both an arc carrier and a weld filler material. the electrode is composed of an alloy or non-alloy metal core wire and a welding rod coating. this coating protects the weld from air and stabilizes the arc. it also causes the formation of a slag layer, protecting the weld and making it shaping. the welding rod can be a titanium welding rod or a reticent one, which depends on the thickness and composition of the coating. the titanium welding rod is easy to weld, and the weld seam is flat and beautiful. in addition, the welding slag is easy to remove. if the welding rod is stored for a long time, rebaking is necessary because moisture from the air will quickly accumulate in the electrode.

2. mig/mag welding: this is an automatic gas-shielded arc welding method. in this method, an electric arc is burned between the current carrier wire and the workpiece under a protective gas shield. the wire fed by the machine acts as a welding rod and melts under its arc. due to the versatility and specificity of the mig/mag welding method, it is still the most widely used welding method in the world. it is used on steel, non-alloy steel, low alloy steel, and high alloy-based materials. this makes it an ideal welding method for production and repair. when welding steel, mag can meet the requirements of thin gauge steel plates with only 0.6mm thickness. the shielding gas used here is a reactive gas such as carbon dioxide or a mixed gas. the only limitation is that when doing outdoor welding, the workpiece must be protected from moisture to maintain the effect of the gas.

3. tig welding: the arc is generated between the refractory tungsten welding wire and the workpiece. the shielding gas used here is pure argon, and the welding wire fed is uncharged. welding wire can be fed by hand or mechanically. some specific applications do not require feeding wire. the material being welded determines whether direct current or alternating current is used. when using direct current, the tungsten welding wire is set to the negative electrode. because it has deep welding penetration capabilities, it is very suitable for different types of steel, but it does not have any "cleaning effect" on the weld pool. the main advantage of the tig welding method is that it can weld a wide range of materials. including workpieces with a thickness of 0.6mm and above, and the materials include alloy steel, aluminum, magnesium, copper and its alloys, gray cast iron, ordinary dry, various bronzes, nickel, silver, titanium, and lead. the main application area is welding used as a root pass on thin and medium thickness workpieces on thicker sections.