焊接方法大全（Complete welding method）.doc

焊接方法大全（Complete welding method） Welding method Daquan.Txt14 enthusiasm is a great strength of mind, from the internal burst out, inspire us to play the infinite wisdom and vitality; passion is a strong pillar, no matter how difficult the situation is, always gave birth to our optimistic spirit of perseverance and tenacity...... Without passion, there is no colour in the sky of life. Introduction to welding methods (1 hand arc welding) hand arc welding is the earliest and most widely used welding method in various arc welding methods. The utility model is an electrode coated with an external coating for electrode and filler metal, and the arc is burned between the end of the welding rod and the surface of the weldment. Coatings, under the action of electric arc heat, can produce gas to protect the arc, on the other hand, it can produce molten slag covering the surface of molten pool and prevent the interaction between molten metal and surrounding gas. The more important role of molten slag is to produce a physical chemical reaction with molten metals or to add alloying elements to improve the weld metal energy. Hand arc welding equipment is simple, light and flexible. The utility model can be used for welding short seams in maintenance and assembly, especially for welding parts that are difficult to reach. Hand welding can be applied to most industrial carbon steel, stainless steel, cast iron, copper, aluminium, nickel and alloy by hand welding. (2) tungsten gas shielded arc welding. This is a non arc gas shielded arc welding. It uses the arc between the tungsten electrode and the workpiece to weld the metal. Tungsten welding process to melt, only play the role of the electrode. At the same time, argon or helium gas is sent by the nozzle of the torch to protect it. Additional metals can be added as needed. Internationally known as TIG welding. Because of the good control of heat input, tungsten gas shielded arc welding is an excellent way to connect sheet metal and b