Effect of alloy elements on the weld of galvanised sheet studied by first-principles

Abstract

To solve the problem of zinc to the weld quality of galvanised sheet, alloy elements (Cu, Nb, Y) have been added to combine with zinc to form stable compounds during welding. The structure and properties of CuZn, NbZn₃ and YZn compounds were calculated by first-principles. The calculation results show that all three elements form a stable alloy with Zn. Among the alloys formed, CuZn has the best mechanical properties. MIG welding experiments of galvanised sheet were conducted to verify the effects of Cu addition on the weld seam formation. The experimental results show that the addition of Cu powder has little influence on the macro-morphology of the weld. In the centre of the weld, ferrite structure is refined and micro-hardness is improved.

KEYWORDS:

• First-principles
• microstructure
• galvanised steel sheet
• MIG welding

Disclosure statement

No potential conflict of interest was reported by the author(s).

Additional information

Funding

This work is supported by the National Natural Science Foundation of China [grant number 51665037]; Key Laboratory of Lightweight and High Strength Structural Materials of Jiangxi Province [grant number 20171BCD40003]; Key Laboratory of Nondestructive Testing Ministry of Education, Nanchang Hangkong University of China [grant number EW201980090].