Views: 0 Author: Site Editor Publish Time: 2016-09-30 Origin: Site
Is the most commonly used welding method for stainless steel hand welding (MMA), followed by the gas metal arc welding (MIG/MAG) and tungsten inert gas welding (TIG). Although these welding method is familiar to most of the stainless steel industry, but we think this area is worthy of in-depth discussion.Is the most commonly used welding method for stainless steel hand welding (MMA), followed by the gas metal arc welding (MIG/MAG) and tungsten inert gas welding (TIG). Although these welding method is familiar to most of the stainless steel industry, but we think this area is worthy of in-depth discussion.
1, manual welding (MMA) : manual welding is a very common, easy to use welding method. The length of the arc by the hand of the adjustment, it depends on the size of the gap between electrode and workpiece. At the same time, when the carrier as arc, welding electrode and weld filler material.
This welding method is very simple, almost all can be used for welding materials. For outdoor use, it has good adaptability, even underwater use. Most of the welding machine can TIG welding. The electrode welding, arc length is determined by people's hands: when you change the electrode and workpiece aperture, you also change the length of the arc. In most cases, the welding with direct current, electrode arc both as the carrier, at the same time as the weld filler material. By metal or alloy metal core wire and electrode covering. The protective layer coated weld from the air, stable arc. At the same time it also cause the formation of slag layer, protect the weld shape. Welding electrode can be titanium type electrode, but also sealed, it depends on the thickness of coated and ingredients. Titanium type electrode is easy to welding, weld flat and beautiful. In addition, welding slag is easy to remove. If electrode storage time long, must bake again. Because the moisture from the air will soon accumulate in the electrode.
2, MIG/MAG welding: this is an automatic gas shielded arc welding method. In this method, under the protection of gas shielded arc between current carrier of wire and workpiece burn. The machine into the wire as electrode, under their own arc melting. Due to the universality and particularity of the MIG/MAG welding method advantages, yet she is still the world's most widely welding method. It USES steel, alloy steel, low alloy steel and high alloy as the base material. This makes it an ideal production and repair welding method. When welding steel, MAG can satisfy only 0.6 mm thick thin steel plate. Here using shielding gas is reactive gas, such as carbon dioxide or mixed gas. The only limitation is that when make outdoor welding, must protect the workpiece is not be affected with damp be affected with damp, to keep the effect of the gas.
3, TIG welding, arc between refractory tungsten electric wire and workpiece. Pure argon shielding gas is used here, into the wire is not charged. Wire can be either hand, can also be sent machinery. There are also some specific purpose. Don't need to wire is determined by the material of welding the direct current (dc) or an alternating current is adopted. Using direct current (dc), set the tungsten electric wire as the cathode. Because it has deep penetration ability, is very suitable for different kinds of steel, but the weld molten pool has no "clean".
The main advantage of the TIG welding can be big welding material to a wide range. In more than 0.6 mm and artifacts, including thickness material include alloy steel, aluminum, magnesium, copper and its alloy, grey cast iron, ordinary dry, all kinds of bronze, nickel, silver, titanium, and lead. The main application field is welding of thin and medium thickness of the workpiece, on the thicker cross section used as root bead welding.