Lapping full-penetration laser welding method for stainless steel heat exchange plates

Abstract

A lapping full-penetration laser welding method for stainless steel heat exchange plates includes the following steps of pre-welding preparation, connecting method adoption, setting of welding parameters, and protective gas adoption. A continuous laser is adopted for full penetration of the heat exchange plates of the equal thickness. The rule of influence of different welding parameters on the depth of penetration, width of penetration and mechanical property of full-penetration joints and on the oxidation stain of the weld surface is obtained by the orthogonal experimental method through optimization, the widths of penetration of the upper interface and the lower interface are increased by a larger positive off-focus value, and the quality of welded joints is improved by limiting the depth of penetration of the welded heat exchange plates at the lower layer.

Description

technical field [0001] The invention belongs to the technical field of metal welding, and in particular relates to a laser welding method for overlapping full penetration of stainless steel heat exchange plates. Background technique [0002] Plate heat exchangers have the advantages of high heat exchange efficiency, small heat loss, compact and light structure, and can meet the needs of different working conditions by changing the plate shape. Therefore, plate heat exchangers are widely used in the chemical industry. With the national With the development of economy and the progress of science and technology, small plate heat exchangers can no longer meet the production needs. However, large plate types are prone to defects such as deformation and misalignment between plates during application, especially in plate types with deep corrugations and wide channels. [0003] Therefore, it is urgent to find a method suitable for fixing large-scale heat exchange plates to prevent ...

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Problems solved by technology

[0002] Plate heat exchangers have the advantages of high heat exchange efficiency, small heat loss, compact and light structure, and can meet the needs of different working conditions by changing the plate shape. Therefore, plate heat exchangers are widely used in the chemical industry. With the national With the development of economy and the advancement of science and technology, small plate heat exchangers can no longer meet the production needs

However, the large plate type is prone to defects such as deformation and misalignment between the plates during application, especially in the plate type with deep corrugation depth and wide channel.

[0003] Therefore, it is urgent to find a method suitable for fixing large-scale heat exchange plates to prevent deformation and dislocation of the plates. However, because the bottom of the corrugated grooves of the plates is generally narrow, the plates are thin, and the corrugation forms are changeable, the plate is fixed. The method requires path automation, and the fixation process is stable and reliable

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