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Precautions In Automatic Welding Machine Welding Process
Mar 07, 2011

Welding is a local rapid heating and cooling process. The welding machine area cannot be expanded and contracted freely due to the constraint of the surrounding workpiece body, and welding stress and deformation are generated in the weldment after cooling. After welding, important products need to eliminate welding stress and correct welding distortion. Modern welding techniques have been able to weld welds with no internal or external defects and mechanical properties equal to or higher than those of the connected body. automatic welding machine The mutual position of the welded body in the space is called a welded joint. The strength at the joint is not only affected by the quality of the weld but also related to its geometry, dimensions, stress conditions and working conditions.

The basic forms of joints are butt joints, lap joints, T-joints (cross joints) and corner joints. The cross-sectional shape of the butt joint weld depends on the thickness of the welded body before welding and the form of the groove on both sides. When welding thicker steel plates, various shapes of bevels are made at the edge to facilitate penetration into the electrode or welding wire. Groove form has single-sided welding groove and two-sided welding groove. When selecting the groove type, in addition to ensuring penetration, automatic welding machine considerations such as convenient welding, less amount of filler metal, small welding distortion and low processing cost of the groove should be considered. When two steel plates with different thicknesses are butted together, in order to avoid serious stress concentration caused by rapid change of the cross section, the thicker edges of the plates are often thinned gradually to reach the same thickness at both edges. Butt joints have higher static strength and fatigue strength than other joints. For joints that work under alternating loads, impact loads or in low-temperature high-pressure vessels, the welding of butt joints is often preferred.

The pre-welding preparation of the lap joint is simple, the assembly is convenient, the welding deformation and the residual stress are small, and it is often used at the site to install the joint and the unimportant structure. automatic welding machine In general, lap joints are not suitable for working under alternating loads, corrosive media, high or low temperatures, and the like. The use of T-joints and corner joints is usually due to structural needs. The incomplete weld fillet weld feature on the T-joint is similar to that of the lap joint. When the weld is perpendicular to the direction of the external force, it becomes a frontal fillet weld. At this time, the surface shape of the weld will cause different degrees of stress concentration. The weld penetration of the fillet weld is similar to the butt joint.

The corner joints have low bearing capacity and are generally not used alone. They are only improved when the penetration is complete or when there are fillet welds inside and outside, and they are mostly used at the corners of closed structures. Welded products are lighter than rivets, castings and forgings, and can reduce weight and save energy for transportation. The sealability of welding is good and it is suitable for manufacturing various types of containers.

The development of joint processing technology, combined with welding and forging, casting, can be made into large-scale, economic and reasonable casting and welding structures and forging welding structures, automatic welding machine with high economic benefits. The welding process can effectively use the material. The welding structure can use different performance materials in different parts and give full play to the advantages of various materials to achieve economical and high quality. Welding has become an indispensable and increasingly important processing technology in modern industry.

In modern metal processing, welding has developed later than casting and forging processes, but it has developed rapidly. The weight of the welded structure accounts for about 45% of the steel production. The proportion of welded structures of aluminum and aluminum alloys is also increasing. The welding process of the future, on the one hand, should develop new welding methods, welding equipment and welding materials to further improve welding quality and safety and reliability, such as the improvement of existing arc, plasma arc, electron beam, laser and other welding energy sources; use of electronic technology And control technology to improve the process performance of arcs and develop reliable and lightweight arc tracking methods. automatic welding machine On the other hand, it is necessary to improve the level of welding mechanization and automation, such as the welding machine to realize program control and digital control; to develop a special welding machine that automates the entire process from preparation to welding and quality control; and to extend and expand numerically controlled welding robots on automatic welding machines. And welding robots can increase the level of welding production and improve the welding hygiene conditions.