stainless steel sheet

Stainless steel sheet stamping features

(1) High yield point, high hardness, significant cold hardening effect, easy to crack and other defects.

(2) the thermal conductivity is poor than ordinary carbon steel, resulting in the required deformation force, blanking force, deep drawing force.

(3) The plastic deformation is severely hardened during deep drawing, and the thin plate is easy to wrinkle or fall off the bottom.

(4) The deep drawing die is prone to the phenomenon of bonding tumor, leading to serious scratches on the outer diameter of the parts.

(5) When deep drawing, it is difficult to achieve the expected shape.

The welding of stainless steel sheet has the following characteristics

(1) Stainless steel sheet has poor thermal conductivity and is easy to burn through directly.

(2) There is no need for welding wire, and the base metal is fused directly.

Therefore, the quality of stainless steel sheet welding is closely related to the operator, equipment, materials, construction methods, welding external environment and testing and other factors.

In the welding process of stainless steel sheet, no welding material is needed, but the following materials are required to be relatively high: one is the purity of argon gas, flow rate and argon passing time, two is tungsten pole.

Weldability analysis of stainless steel sheet

The physical characteristics and shape of stainless steel sheet directly affect weld quality. Stainless steel sheet has small thermal conductivity and large linear expansion coefficient. When the welding temperature changes quickly, the thermal stress is large, and it is easy to burn through, bite edge and wave deformation. Stainless steel sheet welding with plate butt welding of molten pool is mainly influenced by arc force, molten pool of metal effect of gravity and molten pool of metal surface tension, when the volume of molten pool of metal, quality and weld width, the depth of molten pool depends on the size of the arc, and arc force and depth of molten associated with welding current, weld width is determined by the arc voltage.

Molten pool, the greater the volume is, the greater the surface tension when cannot balance the arc surface tension force and molten pool of metal, gravity will cause the molten pool burning through, and local heating and cooling in the process of welding, the welding produce non-uniform stress and strain, when weld longitudinal shortening on the plate edge stress exceeds a certain value, can produce serious wave deformation, The shape quality of the workpiece is affected. Under the same welding method and technological parameters, using different shapes of tungsten poles can reduce the heat input of welded joints, which can solve the problems of weld penetration and workpiece deformation.

Process method for TIG welding of stainless steel sheet

With the continuous development of modern manufacturing industry, stainless steel sheet is widely used in national defense, aviation, chemical industry, electronics and other industries, 1~3mm stainless steel sheet welding is also more and more, therefore, it is necessary to master the process essentials of stainless steel sheet welding. TIG welding uses pulsed arc, which has the characteristics of low heat input, heat concentration, small heat affected zone, small welding deformation, uniform heat input and better control of line energy, etc. During welding, the protective airflow has the cooling effect, which can reduce the outer temperature of the weld pool and improve the outer tension of the weld pool. TIG welding is easy to operate, easy to observe the state of the molten pool, dense weld, good mechanical properties, beautiful appearance. At present TIG welding is widely used in various industries, especially in the welding of stainless steel sheet.

Application of manual argon tungsten arc welding in stainless steel sheet welding

Argon tungsten arc welding is a kind of open arc welding, with stable arc and concentrated heat. Under the protection of inert gas, the welding pool is pure and the weld quality is good. But in the welding of stainless steel, especially austenitic stainless steel, the weld side also needs to be protected, otherwise there will be serious oxidation, affecting the weld forming and welding performance.