Processing technology, assembly and welding technology of Welding materials

【Summary Description】 The welding production process can be attributed to the welding production of materials (including basic metal materials and various auxiliary, filling materials, purchased blanks and parts, etc.) manufactured by equipment (material preparation equipment, assembly welding equipment, etc.) The process of making products. The main body of this process is the staff involved in production, including direct (basic production workers, auxiliary workers, engineering and technical personnel) and indirect (management personnel, service personnel) production personnel and inspection personnel. Of course, it is also necessary to start the machine's energy (I. e. power) and a certain amount of production space (I. e., the production workshop site) to carry out this production process. Therefore, welding production is composed of materials, equipment, sites, power and staff, which are part of welding production. Today, Xiao Bian will learn the material processing technology, assembly and welding technology of welding production together with everyone. 1. Material processing technology The material processing of welding production including steel pretreatment refers to the preparation and processing before assembly welding, which refers to a series of processing of the basic material of most welding structures-metal rolling, such as steel pretreatment including correction (straightening), cleaning, surface protection treatment, pre-blanking, etc; marking (marking), cutting (blanking), edge processing, forming (including bending) and groove finishing before welding. It accounts for about 25% to 60% of the total processing workload. If the material processing technology is poor, that is, the blank quality is poor, or the size error is large, the lack of interchangeability, or the groove processing is not appropriate, or the parts are irregular, deformation, etc., which make the assembly difficult, welding quality decline, sometimes can not be assembled, the need for trimming, thus greatly reducing the production efficiency. The use of mechanized and automated assembly welding technology, the requirements are more stringent, otherwise it will produce welding defects, so in order to obtain a stable welding production process, to ensure excellent product quality, to develop a reasonable material processing technology is very important. The following are some of the main material processing technology: (1) Pretreatment of steel 1) Correction: Due to transportation, storage, rolling, cooling and other links, the rolled steel has undesirable deformation such as wave, overall bending, local protrusion, edge bending, etc. Some rolled materials, such as steel with a thickness of 5mm or less, are supplied in rolls and must be flattened and corrected before being put into welding production, otherwise the accuracy of marking, material marking, cutting and other processes will be affected. 2) surface cleaning and surface protection treatment: removal of rust, oil and oxide on the surface of steel and parts is a process that is often ignored in welding production. The result of this may destroy the normal production, such as the continuous NC cutting blocked; the use of efficient welding methods difficult, or even can not be carried out, such as submerged arc welding, narrow gap welding, resistance spot welding and seam welding. (2) lofting, marking and marking this process is used to check the correctness of design drawings, determine the blank blanking size of parts, and make templates, etc. The design structure is drawn according to the scale of 1:1 (enlarged sample), which is called lofting. Lofting is a precise, meticulous and highly skilled work that has a great impact on future processing. Generally, lofting is carried out in the lofting room. In order to improve the lofting efficiency and quality, optical lofting and computer lofting are used in modern welding production. The parts or blanks to be processed are marked on metal materials for cutting or assembly. This process is called marking, while marking with a template is called marking. Marking and marking shall be carried out on a dedicated platform, which shall be within the scope of crane activities. When using profiling template blanking or using CNC cutting machine blanking, marking and marking may not be carried out in advance. (3) cutting welding production is called metal tailoring, so the cutting of various metal materials is an important step. The introduction has been introduced in the welding production of the major progress of the cutting process, mainly refers to the mechanization and automation of the thermal cutting process, coupled with the progress of the thermal cutting itself, the original that the thermal cutting production efficiency is low, the concept of poor quality of the cut has undergone a fundamental change. In some factories, all or most of the steel products with a thickness of more than 6mm are cut by mechanized and automated (numerical control) thermal cutting process, and the marking and marking steps are omitted, thus greatly improving the cutting quality. The edges of many products are the products of mechanized thermal cutting, with smooth cuts and correct part sizes, thus greatly improving the product quality. (4) bending and forming welding structure in the manufacture of bending and forming work occupies a large proportion, some structures of metal materials 80% ~ 90% need to be bent and forming processing. For example, long-distance pipeline structure, boilers, pressure vessels, spherical vessels and other chemical petroleum equipment belong to this type of structure.

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Welding production assembly process

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