AZ31B镁合金A-TIG焊活性剂成分的均匀设计与优化

Uniform design and optimization of active flux for A-TIG welding of AZ31B magnesium alloy

关键词:  镁合金  活性剂  均匀设计

Key words:  magnesium alloy  active flux  uniform design

摘要:

根据A-TIG焊对AZ31B镁合金活性剂在焊缝熔深、焊缝表面成形质量、焊缝力学性能、焊缝强化机理、工艺可行性和环保无毒等方面的要求,选取4种组元(TiO₂,SrCl₂,ZrO₂和Y₂O₃)活性剂.采用均匀设计法的拟水平法设计复合活性剂配方.根据焊缝熔深和焊缝表面成形质量的试验结果建立数学模型,通过对不同数学模型对比分析,确定活性剂各组元的最佳配比,并验证配方的正确性.结果表明,采用均匀设计法设计活性剂配方,焊缝可获得最大熔深和较好的表面成形质量,并且焊接接头具有良好的力学性能.

Abstract:

Active fluxes with four components (TiO₂, SrCl₂,ZrO₂ and Y₂O₃) were developed based on the requirements of A-TIG welding of AZ31B magnesium alloy on active fluxes, including weld penetration,weld appearance,mechanical properties and reinforcement mechanism of weld,process feasibility and non-toxic etc. The composite active fluxes were designed by uniform design method. A mathematical model was established according to the weld penetration depth and weld appearance. The optimized ingredients of active fluxes were determined and verified through the comparative analysis with different mathematical models. The results show that the maximum penetration could be obtained with good weld appearance and the welded joint had excellent mechanical properties,when the active fluxes was designed with the proposed uniform design method.