When welding related 304 stainless steel wire mesh products: due to the characteristics of stainless steel itself (for example, the thermal expansion coefficient of 304 stainless steel is 1.5 times that of low carbon steel and high chromium series stainless steel; the thermal conductivity is about 1/3 that of low carbon steel The thermal conductivity of high chromium series stainless steel is about 1/2 that of low carbon steel; the specific resistance is more than 4 times that of low carbon steel, and high chromium series stainless steel is 3 times that of low carbon steel.) Compared with stainless steel welding, it has its particularity, and it is more prone to produce various defects in its welded joints and its heat affected zone (HAZ). Pay special attention to this when welding. For welding materials such as stainless steel wire and stainless steel wire mesh, if necessary, degreasing and descaling treatment is also performed to improve the welding quality.
The argon arc welding process is the most commonly used welding process for stainless steel mesh deep-processed products. Argon arc is a gas shielded welding technique. The protective gas argon is passed around the arc welding to isolate the air from the welding area and prevent the oxidation of the welding area to achieve the purpose of double-sided forming. Its technical characteristics are that the back of the weld bead is filled with argon, low current (generally welding current is about 60A, the current can be manually adjusted), short arc (arc voltage is below 10V, the voltage is generally not adjustable), the welding process swing should use zigzag Method, the interlayer temperature is as far as possible, the color of the weld is white and yellow as the standard, the angle of the argon arc welding torch is 90 degrees and below in the advancing direction, and the gap at the mouth is controlled at about 2mm.
Welded mesh basket, stainless steel welded wire mesh, stainless steel welded wire mesh, etc., are produced by fully automatic stainless steel welding machines. The production of stainless steel welded mesh in rolls uses the principle of resistance welding to complete the welding of stainless steel mesh: the circuit is closed so that the entire closed circuit and current are equal; but the resistance is different everywhere , Especially in the non-fixed contact, that is, the resistance of the welding machine's stigma is the largest, this resistance is called contact resistance in physics.
Stainless Steel Welded Mesh In Rolls
According to the thermal effect law of electric current (also known as Joule's law), Q = I ^ 2; × Rt. It can be known that when the current is equal, the part with greater resistance generates more heat, and the resistance of the stigma during welding is the largest. The electric heat generated by the part is naturally the most. When the stigma presses the horizontal and vertical diameters together, it releases a lot of heat, which makes the horizontal and vertical diameters instantly dissolve and bond. Since the automatic row welding machine is performed in a row of stigmas at the same time, the production efficiency of electric welding stainless steel wire mesh is extremely high.
The roll welding technology of stainless steel mesh, also known as seam welding, uses a pair of roller electrodes to replace the spot welding cylindrical electrode. The welded workpiece moves between the rollers, creating a sealed weld seam with overlapping nuggets to weld the workpiece. Way up. Generally, AC pulse current or amplitude modulation current is used, and three (single) phase rectification, intermediate frequency and high frequency DC current can also be used. Roll welding is widely used in the butt joint or seam link of stainless steel round hole screen, stainless steel filter tube (such as multi-layer petroleum sand control pipe), and high mesh stainless steel wire mesh. It is a common technology for deep processing of stainless steel mesh.
In the production of stainless steel filters, the welding process of some stainless steel filters with fine filtration precision is often used. Because these stainless steel screens are mostly thin and light, it requires accurate positioning and efficient welding processes to be completed. Plasma welding is such an efficient welding technology: Plasma arc is the ionization of ion gas to generate a high-temperature ion gas stream, which is ejected from the orifice of the nozzle and compressed to form an elongated arc column. Conventional free arc, such as: argon arc welding only reaches 5000-8000K. Because the plasma arc has the characteristics of slender arc column and high energy density, it has a wide and special role in the field of stainless steel mesh welding.
In addition, silver welding technology also has special applications in the welding of stainless steel mesh belts, and soldering technology in some electronic components filter baskets.