tailieunhanh - Weld Symbol - Kí hiệu đường hàn trên bản vẽ KT

When welds are specified on engineering and fabrication drawings, a cryptic set of symbols is used as a sort of shorthand for describing the type of weld, its size, and other processing and finishing information. The purpose of this page is to introduce you to the common symbols and their meaning. The complete set of symbols is given in a standard published by the American National Standards Institute and the American Welding Society: | Deciphering Weld Symbols When welds are specified on engineering and fabrication drawings a cryptic set of symbols is used as a sort of shorthand for describing the type of weld its size and other processing and finishing information. The purpose of this page is to introduce you to the common symbols and their meaning. The complete set of symbols is given in a standard published by the American National Standards Institute and the American Welding Society ANSI A WS Symbols for Welding and Nondestructive Testing. Our thanks to Dr. Kent L. Johnson past Chairman of the AWS Chicago Section for his many helpful comments on the content of our welding pages. The structure of the welding symbol The horizontal line--called the reference line--is the anchor to which all the other welding symbols are tied. The instructions for making the weld are strung along the reference line. An arrow connects the reference line to the joint that is to be welded. In the example above the arrow is shown growing out of the right end of the reference line and heading down and to the right but many other combinations are allowed. Quite often there are two sides to the joint to which the arrow points and therefore two potential places for a weld. For example when two steel plates are joined together into a T shape welding may be done on either side of the stem of the T. arrow aide other aide The weld symbol distinguishes between the two sides of a joint by using the arrow and the spaces above and below the reference line. The side of the joint to which the arrow points is known rather prosaically as the arrow side and its weld is made according to the instructions given ldhuan loptvgs KCT C3-lienkethan 1 below the reference line. The other side of the joint is known even more prosaically as the other side and its weld is made according to the instructions given above the reference line. The below arrow and above other rules apply regardless of the arrow s direction. The flag growing