What is the Fusion Welding
Fusion welding, is one of the most common welding methods. The so-called welding, refers to the welding process, the metal joints at high temperatures under the action of melting state and completed the welding method, can form a solid welded joints. Due to the workpiece being welded together closely, under the action of temperature field, gravity and the like, no pressure is exerted on the melted melt of the two workpieces. When the temperature is reduced, the melting part of the condensation, the two work pieces were firmly welded together to complete the welding method. Due to the inherent high temperature phase transformation during the welding process, a heat-affected zone is created in the weld zone. In contrast to solid-state welding and welding, solid-state welding does not involve the melting of metals.
1) gas welding. The combustible gas combusts the released heat with the combustion-supporting oxygen, melts the filler wire and the weldment, and joins the metal. Combustible gases are acetylene, hydrogen, water gas and so on. Acetylene gas produced by acetylene and oxygen gas can also cut steel.
(2) Arc welding. Arc welding can be divided into manual arc welding, submerged arc welding and gas shielded welding. Manual arc welding, electric arc hot melt welding rod and the formation of weld pool, the electrode melting and decomposition of the electrode gas and slag melting to protect the pool is not invaded by air, the welder along the weldment welding electrodes, the molten metal to form a weld, cooling After the solidification in the seam surface of the slag removal. Manual welding equipment is simple, for flat, vertical, horizontal, Yang welding, but low efficiency, labor-intensive.
(3) submerged arc welding, arc and molten pool are buried in granular flux, with automatic or semi-automatic machine shop flux along the welding seam continuous feeding wire and moving arc, only supine operation. The advantages of high efficiency, good quality, provincial welding materials, energy saving, labor intensity is small.
(4) Gas shielded welding is through the protective gas to the air and molten metal isolation, so that the molten metal is not invaded by air and get a good weld. The gas used are argon, helium, carbon dioxide and so on.
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