دراسة عملية و نظرية لتوزيع الإجهادات الحرارية في وصلات اللحام النقطي لسبيكة الألمنيوم-مغنيسيوم (5052)‎

الملخص EN

In this study Tungsten Inert Gas spot welding (TIG Spot ) is carried out for Al- Mg alloy (5052) with the overlap join for sheet of 1mm thickness.

Welding process is carried out at different welding currents and times at a constant arc length (1.6mm).

optimum welding conditions are determined depending on maximum shear force of weld joint.

Theoretical work is by using finite element method by utilizing program (Ansys 5.4 ) to calculate thermal stresses in TIG Spot at welding currents (80,100,110,120)Amp and welding times(6,7,8)sec.

The results showed that the best maximum shear force for welds was 2000N at 110Amp and 6sec.

These result gives better distribution for thermal compressive stresses through depth and diameter of spot weld.

The comparisons between computational results and experimented work from hardness measurement through a cross section of spot weld have a good agreement.