The welding method of Stainless steel pipe
The welding method commonly used of stainless steel is manual welding (MMA), followed by metal arc welding (MIG / MAG) and tungsten inert gas welding (TIG). Although these welding stainless steel industry big most people are familiar with, but we believe this area worthy of further exploration.
1, SMAW (MMA):. Manual welding is a very common, easy to use method of welding arc length is adjusted by human hands, it depends on the size of the gap between the welding electrode and the workpiece while when used as. arc carrier, also welding seam filler material.
This welding method is very simple and can be used to weld almost all materials for outdoor use, it has good flexibility, even under water use is also no problem. Most welders can TIG welding electrode welding, the arc length depends on the person's hand: when you change the slit electrode and the workpiece, you can change the length of the arc, in most cases, welding using DC arc electrode both as a carrier, as well as the weld filler material of the electrode. an alloy or non-alloy metal cored wire and electrode coating composition. this coating layer protection against weld against air, while stabilizing the arc. it also causes the formation of slag layer to protect the weld shaping it. welding can be titanium electrode, but also seal in nature, depending on the coating thickness and composition of titanium type electrode easy to weld, weld flat appearance. in addition, easy slag removal. If the rod storage for a long time, must be re-baking. 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, gas shielded arc protection under current carriers between the wire and the workpiece into the baking machine as wire rod. in the arc melting itself due to the advantages of MIG / MAG welding versatility and specificity, so far she is still the world's most widely used welding methods. it is used in steel, non-alloy steel, low alloy steel and high alloy material group. this makes it ideal for the production and repair welding. when welding steel, meet the requirements of MAG only 0.6mm thick, thin gauge steel protective gas used here is a reactive gas, such as carbon dioxide or a mixed gas the only restriction is that when the outdoor welding, the workpiece must be protected from moisture, in order to maintain the effect of the gas.
3, TIG welding: electric arc between a refractory electrode wire and the workpiece W shielding gas used here is pure argon, into the welding wire can either uncharged bypass to be sent includes certain machinery... do not need to use the wire fed. material to be welded is determined with DC or AC power. when using direct current, the wire W is set to a negative because it has deep penetration capability for different types of steel is appropriate but the weld puddle without any "cleaning action."
The main advantage of TIG welding method is welding a wide range of large material, including the thickness of 0.6mm and above the work, materials, including steel, aluminum, magnesium, copper and its alloys, gray cast iron, ordinary dry, a variety of bronze, nickel, silver, titanium and lead. the main application area is welding thin and medium thickness of the workpiece, it is used as a root pass on thick cross section.