Improvement of the Strength of Spot Welding Joint for Aluminum Plates Using Powders as Additive


This research is interest in increasing the strength of spot welding joint for thincommercial Aluminum by adding casting component to the welding zone in the form ofpowder. Those components are copper, manganese and magnesium which are added in adifferent percentages it appear that the strength of the spot welding has been improvedby (14.5%) when adding(0.4 grams of magnesium),(0.1 grams of manganese ) and (0.4gram of copper).The powder is added in the welding zone boundary after made a single hole with adepth of (0.375mm) and a diameter of (1mm) in the center of spot welding point.To increase the welding strength, five holes have been made with the same abovedimensions through the welding zone boundary. The percentages of additive used afterreparation the reduction of Aluminum powder.The value of shearing strength increase with a percentage of (27.3%) as comparingwith those without additive.Also, heat treatment has been done, which gave a redaction in the strength of spotwelding. It has been observed that the increase in the temperature of heat treatmentresult in decreasing in the spot strength. Welding and cooling environment have aneffect on the strength of welded specimen. Hence, air welding environment gives a goodwelding strength.