Last year, our factory produced hundreds of large and small slab beam members for a factory in Tianjin. The largest slab beams are 2.4m high and 16m long. The slab beams are composed of upper and lower wing plates, webs, and ribs. Due to the large amount of welding work, how to control welding deformation has become the key to this product. 1 Welding Deformation and Preventive Measures 1.1 Analysis of Welding Deformation The main structural types of large slab beams are shown below. The material of the upper and lower wing plates is 16Mn, = 40mm, and the web = 20mm. Due to the large amount of welding, the large slab beam has the following deformation after welding: the slab beam is deformed due to improper welding sequence and asymmetry. Due to the shrinkage of the fillet welds of the web and the ribs, the web deforms unevenly. Due to the shrinkage of the fillet welds of the webs and wings, angular deformation occurs. Due to longitudinal shrinkage, flexural deformation occurs along the length. Distortion due to unreasonable welding. 1.2 Technological measures to prevent deformation The 4 main corner seams are welded by manual welding and submerged arc automatic welding. Use a reasonable welding sequence. 1.3 Welding sequence for assembly 1.3.1 Welded wing plates and webs of the four main angle seams of the wing plates and webs form an I-beam, and the connection form of the web and wing plates is as shown. When welding, it is required to tilt the slab beam 35 according to the welding sequence shown in the manual welding of 2 layers, Page, Zhang Shengjiu (150-Male, Sichuan Chengdu senior engineer has long been engaged in welding technology and welding equipment technology development work published paper 20 The rest of the article., + Cl11CninaAcademicloumalElectronicPublishingHouse.Alrngntsreserved, nwp: spraying distance: 250 ~ 280mm spraying angle: 87 3.5 measure the thickness of the repaired parts to be sprayed and check whether the coating thickness meets the design requirements. 3.6; post-processing of the remaining layer determines the positioning and clamping position and the processing amount according to the shape and technical requirements of the bearing. 3.7 Inspection and testing whether the repaired size meets the original drawing design requirements. 3.8 Hewa grinding and scraping According to the situation of contact points after tiling, grind and scrape until the contact spots reach more than 85% of the contact surface and are evenly distributed. 4 The test results have achieved our expected results through bench test, wear test, hardness determination and bond strength test. 5 Conclusion a. The coating performance is good. The alloy coating formed by oxyacetylene flame powder spray has the characteristics of porous cavities, and the porosity rate is about 20%. This porous coating can store oil and has oil storage properties. Compared with traditional metal alloy layers, Its abrasion resistance and abrasion reduction have been greatly improved and improved. Advanced technology. Oxyacetylene flame powder spraying equipment is simple, less investment, quick effect, convenient operation, easy to popularize; at the same time, the process is flexible, the construction is convenient, and the pollution is small. It is a promising new technology. This technology is selected for large and heavy sliding bearings. The repair is totally worth trying and promoting. Fish Aquarium,Aquarium Tank,Aquarium Tank Fish,Fish Tank Aquarium HENGYUE INDUSTRIAL CO.,LTD , https://www.hetoaquarium.com