TAILIEUCHUNG - Standard Handbook of Machine Design P17

CHAPTER 14 FUNDAMENTALS OF ARC WELDING Richard S. Sabo Manager, Educational Services The Lincoln Electric Company Cleveland, Ohio Omer W. Blodgett Design Consultant The Lincoln Electric Company Cleveland, Ohio DEFINITIONS AND TERMINOLOGY / BASIC WELDING CIRCUIT / ARC SHIELDING / NATURE OF THE ARC / OVERCOMING CURRENT LIMITATIONS / COMMERCIALARC-WELDING PROCESSES / ARC-WELDING CONSUMABLES / DESIGN OF WELDED JOINTS / CODES AND SPECIFICATIONS FOR WELDS / DEFINITIONS AND TERMINOLOGY Arc welding is one of several fusion processes for joining metals. By the application of intense heat, metal at. | __CHAPTER 14_ FUNDAMENTALS OF ARC WELDING Richard S. Sabo Manager Educational Services The Lincoln Electric Company Cleveland Ohio Omer W. Blodgett Design Consultant The Lincoln Electric Company Cleveland Ohio DEFINITIONS AND TERMINOLOGY BASIC WELDING CIRCUIT ARC SHIELDING NATURE OF THE ARC OVERCOMING CURRENT LIMITATIONS COMMERCIAL ARC-WELDING PROCESSES ARC-WELDING CONSUMABLES DESIGN OF WELDED JOINTS CODES AND SPECIFICATIONS FOR WELDS DEFINITIONS AND TERMINOLOGY Arc welding is one of several fusion processes for joining metals. By the application of intense heat metal at the joint between two parts is melted and caused to intermix directly or more commonly with an intermediate molten filler metal. Upon cooling and solidification a metallurgical bond results. Since the joining is by intermixture of the substance of one part with the substance of the other part with or without an intermediate of like substance the final weldment has the potential for exhibiting at the joint the same strength properties as the metal of the parts. This is in sharp contrast to nonfusion processes of joining such as soldering brazing or adhesive bonding in which the mechanical and physical properties of the base materials cannot be duplicated at the joint. In arc welding the intense heat needed to melt metal is produced by an electric arc. The arc is formed between the work to be welded and an electrode that is manually or mechanically moved along the joint or the work may be moved under a stationary electrode .The electrode may be a carbon or tungsten rod the sole purpose of which is to carry the current and sustain the electric arc between its tip and the workpiece. Or it may be a specially prepared rod or wire that not only conducts the STANDARD HANDBOOK OF MACHINE DESIGN current and sustains the arc but also melts and supplies filler metal to the joint. If the electrode .

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