Research on Welding Technology of Wear-resistant Cast Steel and High-strength Wear-resistant Steel Plate
Wear-resistant cast steel and high-strength wear-resistant steel plates are widely applied in coal mine hoist, mechanical equipment, light industry, hydroelectric power, petrochemical industry and other fields. To ensure the welding quality of the wear-resistant cast steel and high-strength wear-resistant steel plate and their good wear resistance and performance, the welding technology selection, welding process, welding parameters and welding sequence must be properly selected. This article explains the research of welding technology of wear-resistant cast steel and high-strength wear-resistant steel plate through literature and experimental research.
Material Research
The wear-resistant cast steel and high-strength wear-resistant steel plates have excellent wear resistance and strength, and are generally used in equipment requiring high wear resistance and high strength, such as coal mine hoist, mechanical equipment, etc., which require the use of a large number of wear-resistant cast steel and high-strength wear-resistant steel plate to withstand their high work intensity and abrasion resistance. The wear-resistant cast steel and high-strength wear-resistant steel plate have different chemical compositions and mechanical properties due to their different applications. Therefore, in order to effectively realize the welding of wear-resistant cast steel and high-strength wear-resistant steel plates, it is necessary to select welding materials that are compatible with these materials. Different types of welding materials, welding processes and welding parameters are generally selected according to the mechanical and structural properties of wear-resistant cast steel and high-strength wear-resistant steel plates.
Process Research
In order to guarantee good welding quality of wear-resistant cast steel and high-strength wear-resistant steel plates, manual arc welding, gas shielded arc welding and submerged arc welding are generally used. The following is a brief introduction to each of the three welding processes.
Manual arc welding is widely used in the repair welding of wear-resistant cast steel and high-strength wear-resistant steel plates. Its main advantage is that it is suitable for both ferrous and non-ferrous metals, is low in cost and has good manual maneuverability. However, the manual arc welding has the disadvantage of large heat affected zone and poor penetration of weld, which is easy to cause defects in the weld such as slag inclusion, porosity and cracks.
Gas shielded arc welding is generally used in large-scale welding of wear-resistant cast steel and high-strength wear-resistant steel plate. It has the advantages of fast welding speed and strong arc force, small heat affected zone and low spatter. Moreover, gas shielded arc welding is suitable for a variety of filler materials and can be used to weld various materials. But the large smoke generated during welding should be noticed.
Submerged arc welding is the most common and widely used welding method for wear-resistant cast steel and high-strength wear-resistant steel plate. The advantages of submerged arc welding are that it has large welding depth, fast welding speed, and high production efficiency. The only disadvantage of submerged arc welding is that it needs to identify the welding line prior to welding and requires a large number of skilled workers.
Welding Test
In order to further verify the welding effect of wear-resistant cast steel and high-strength wear-resistant steel plate, a practical welding experiment was conducted. The welded material used in the experiment is a 200mm*200mm*8mm high-strength wear-resistant steel plate. At the same time, the carbon dioxide gas welding process with YAW-6 type electrode and joint angle of 40 degrees was selected. By testing, the following main results were obtained.
The tensile strength of the single side weld is 355MPa, the tensile strength of the four sides weld is 349MPa, the impact fracture energy of the single side weld is 10.6J, the impact fracture energy of the four sides weld is 9.2J; The cross section of the single side weld is 100mm2, and the cross section of the four sides weld is 55mm2.
After welding of the wear-resistant cast steel and high-strength wear-resistant steel plate, the appearance of the weld is smooth and beautiful, and the welding quality is qualified.
Conclusion
The wear-resistant cast steel and high-strength wear-resistant steel plate have different chemical compositions and mechanical properties because of their different applications, so it is necessary to select welding materials that are equivalent to them. The manual arc welding, gas shielded arc welding and submerged arc welding processes are all suitable for the welding of wear-resistant cast steel and high-strength wear-resistant steel plates. According to the requirements of the workpiece, the suitable welding process and welding process should be selected. The experiment confirms that, with the correct selection of welding materials, welding process, welding parameters, and welding sequence, it is possible to stably and safely realize the welding of wear-resistant cast steel and high-strength wear-resistant steel plates, thus ensuring the welding quality of the wear-resistant cast steel and high-strength wear-resistant steel plates.
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