Welding method of dissimilar metals and its products and applications

Abstract

The invention relates to a welding method, a product and an application of a dissimilar metal. The welding method of the dissimilar metal comprises a high-melting-point material to be welded and a low-melting-point material to be welded, the high-melting-point material and the low-melting-point material are mutually overlapped or connected in a sleeving manner to form a welding seam, the welding seam is welded by the aid of electric arc welding, electron beam welding, laser welding or high-frequency welding, the welding temperature is lower than the melting temperature of the high-melting-point material and higher than the melting temperature of the low-melting-point material, the low-melting-point material is melted to serve as a welding material to seal the welding beam and cooled to form a welding channel, and the width L of the welding channel is larger than or equal to 1.5mm. The melted low-melting-point material directly serves as the welding material to seal the welding beam to form the welding channel with a certain width, so that the melted low-melting-point material and the high-melting-point material are mutually permeated in a certain area range to form solid solution, the permeation quantity of high-melting-point metal to low-melting-point metal is controlled, overall strength sufficiently meets use requirements, more importantly, frangibility of the welding channel is reduced, mechanical properties are improved, the requirements for a welding process are low when welding is performed, and the welding method is easier to control.

Description

technical field

[0001] The present invention relates to the field of welding. Background technique

[0002] In the field of welding, it is generally necessary to use solder for the welding connection between two dissimilar metals, which is due to the difference in physical properties of the dissimilar metals themselves. For example, copper and iron, the melting point of copper is about 1000°C, and the melting point of iron is about 1500°C.

[0003] Current copper-iron welding is generally by flame brazing with silver solder. When flame brazing is used, the copper and iron materials do not melt, and the silver solder is heated and melted by the flame to fill the gap between the copper and iron materials and interpenetrate with the copper and iron materials to form copper atoms in the solder. The copper and iron sides infiltrate to form a partial solid solution, and the copper and iron are welded together after cooling. The soldering temperature during this soldering is hig...

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