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เนื้อหาย่อ : INTRODUCTION In the manufacturing, construction, and service industries, the forming and joining of metals by welding is the number one metal joining process. There is a need in modern industry for craftsmen with varying degrees of technical training and skill, and for welding engineers who are able to design weldments, and write specifications. This text, MODERN WELDING, which is written in nontechnical language, is intended for those who need a substantial background in welding fundamentals. It will help the student obtain a working knowl- edge of the properties and characteristics of metals, and common test- ing procedures. It is also intended for those now engaged in welding who want to increase their skills, and for those in industrial plants who are responsible for training welding and cutting operators. MODERN WELDING, which was prepared with the needs of both the apprentice and the journeyman in mind, provides up-to-date cover- age of the welding field in one easy-to-use volume. It covers a multitude of welding procedures; not only the more common gas, arc and resis- tance processes, but those used in aerospace and other modern in- dustries as well.