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"اللحام بالكهرباء"
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The Effect of Adding Metal Powders to the Spot Welded Area of Dissimilar Metals
The process of spot welding has been and remains one of the most important manufacturing processes; the vehicle industry requires the use of this process frequently. To reduce the cost and improve the quality of the products in some applications, it was necessary to weld different metals, and due to the different specifications of welded metals it is necessary to study this situation and try to improve the specifications of the welding area. In this work, 304 stainless steels and SAE1006 was spot welded at different weld current and welding duration values because of their wide use. The aim of this research is improve the welding zone mechanical characteristics and reduce the amount of energy used by using two different types of metal powders have acceptable resistivity which added to the welding area to prevent thermal energy from dissipating rapidly allowing for a stronger bonding, This addition helped to create an extra bond between the base metal and metal powder which improved the mechanical properties of the nugget. It was found that increasing the amount of weld current and welding duration improved the mechanical features of the welding area, and from the results it was clear that the effect of the addition of titanium powder was more effective than nickel powder.
Journal Article
اللحام الكهربائي
يتحدث الكتاب عن اللحام الكهربائي حيث يتناول الكتاب أسس علم المعادن (الفلزات) وتجهيز وصيانة مصادر تغذية القوس الكهربائي والأسس الميتالورجية للحام والالكترودات واللحام اليدوي للصلب قليل الكربون بالقوس والتشوهات والاجهادات أثناء اللحام واللحام اليدوي بالقوس لأنواع الصلب الخاصة واللحام في الصيانة والتزويد باللحام بالسبائك الصلدة واللحام عند صنع منتجات من الصلب ولحام الزهر ولحام المعادن الغير حديدية وقطع المعادن بالقوس الكهربائي وتجهيز أعمال اللحام بالمعدات الميكانيكية واللحام بالتماس وهدف ومضمون العملية التكنولوجية والرقابة الصناعية علي عمليات اللحام والأمن الصناعي والتنظيم الصناعي في أعمال اللحام.
BOOK
The Effect of Humidity Absorbed by Electrode Rods on Quality, Strength and Stiffness of the Weld
Inadequate storage for welding electrode rods might cause humidity absorption by these rods. Humidity effects directly and negatively on the weld quality. This paper is devoted to study such an effect on the quality, strength and stiffness of the weld. Some of Non Destructive Testing (NDT) and Destructive Testing (DT) were implemented on various samples of the same low carbon steel (AISI 1010) with same dimensions. These samples were cut into two pieces and joined by means of Metal Inert Gas welding (MIG) using dry and wet electrode rods separately. A comparison between these samples, which were welded by dry electrode rods and wet electrode rods, has been made. Unlike the samples, which were welded by dry electrode rods, the obtained results of (NDT) showed obviously internal and external defects due to using such wet electrode rods. Meanwhile, (Tensile Testing) results demonstrated a decreasing in stiffness for the samples, which were welded by wet electrode rods.
Journal Article
