Die Forging Die forging is divided into hammer forging and press forging. The similarities between the two are: (1) The die forging deformation process can be divided into three stages: the first stage is the squeezing stage, the second stage is the filling stage, and the third stage is the tying stage. (2) The deformation…
MIG Welding And Carbon Dioxide Gas Shielded Welding 1. Characteristics of molten argon arc welding (1) Like tungsten argon arc welding, it can weld almost all metals, especially for welding aluminum and aluminum alloys, copper alloys and stainless steel. (2) Because the wire is used as the electrode, the current density is large, so the…
Flux Cored Wire Gas Shielded Welding Flux cored wire gas shielded welding is commonly used to weld carbon steel, low alloy steel, stainless steel, cast iron. 1.Advantage (1) Combined protection of gas and slag, the weld bead is beautifully formed, the arc stability is good, the spatter is small and the particles are fine. (2)…
Extrusion The blank is subjected to three-direction uneven compressive stress in the closed cavity, and is extruded from the orifice or slit of the mold to reduce the cross-sectional area, and the processing method for forming the desired product is called extrusion. Classification extruded (1) According to the forming temperature, the extrusion is divided into…
Welding Process 1. Fusion welding: A method of locally heating and melting a surface of a connected object to a liquid and then cooling it into a unit. 2. Pressure welding: The physical effects of friction, diffusion and pressure are used to overcome the unevenness of the two joint surfaces, and the oxide film and…
Submerged Arc Welding Submerged arc welding is a method in which an arc is burned under the flux layer for welding, and electrical and mechanical devices are used to feed and move the arc. 1.Basic principle The welding arc is burned between the wire and the workpiece, and the arc heat melts the ends of…
Brazing 1.Advantage (1) The heating temperature is low, which has little influence on the microstructure and properties of the base metal and is easy to ensure the dimensional accuracy of the weldment. (2) It can realize the connection of dissimilar metals or alloys, metals and non-metals. (3) Some brazing methods can complete dozens or hundreds…
Casting Process 1. Selection principle of pouring position 1) The important working surface or working surface of the casting should be downward. If it is difficult to achieve downward, it should be placed on the side as far as possible. 2) The large plane of the casting should be as far as possible. 3) Most…
Sand Casting And Metal Casting Characteristics Sand casting has a wide range of applications and is suitable for almost all parts production. For some large, single or small batch castings, manual styling is the first choice. The machine shape can improve the molding speed and the dimensional accuracy and quality of the mold, and is…
Advantages And Disadvantages Of Pressure Casting The advantages of pressure casting are as follows: 1) High productivity, can be die-casted 50 to 150 times per hour, up to 500 times, which is convenient for automated and semi-automatic production. 2) The casting has high dimensional accuracy and smooth surface (CT6～9, Ra0.4～3.2 μm). 3) The castings are…