Abstract
Working on the basis of a parameter study of standard PA 66 material, comparative investigations were conducted into material modifications using heat stabiliz ers, glass fibers and minerals. The evaluation criterion applied for the weld quality was the short-time welding factor, this being the quotient of the weld strength and the strength of the base material With standard material, a weld strength almost equivalent to the strength of the base material was attained. With heat-stabilized and mineral-filled material, the welding factor fell to fs = 0.9. Glass-fiber-reinforced PA achieved a maximum value of fs = 0.58, which, in terms of absolute value, corresponds approximately to the base material strength of standard polyamide. Microtome section investigations show how the different weld results come about.