البنية البلورية وآلية الربط لوصلة لحام تبريس الفولاذ / الفولاذ المقاوم للصدأ باستخدام أسلاك لحام مختلفة

Abstract

The aim of this work is to study the possibility of braze welding of austenitic steel AlSl316L , Low carbon steel A 283 Grade C , and austenitic stainless steel to low carbon steel by using Shielded Metal Arc Welding and oxyfuel gas welding equipment . Specimens with square-butt joint design and 2,5, and 7 mm gaps were joined using four different types of filler metal DIN SCuZn40Si , DIN ELCuSn7 , DIN ELCuSi3 , and DIN ENi-BG11. Other factors were kept constant at 100 A , 22 V , and 5 mm of metal thickness . Microstructures and mechanical tests ( Tensile test and Bending text ) were performed to study the properties of welding specimens . From microscopic examination , it was found that the bonding by braze using OFW with SCuZn40Si filler was similar to that of brazing process . On the other hand the bonding result from braze using SMAW with ELCuSi3 and ELCuSn7 were intermediate between brazing and electric are welding while the use of ENi-BG11 filler by SMAW shows a bond exactly as that of electric arc welding. Results show that maximum tensile strength and bending force can be achived by ENi-BG11 filler .