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ASME B31.3-2016 <br /> (b) actual throat: the shortest distance from the root against a corresponding primary weld coupon to dem- <br /> of a fillet weld to its face onstrate continued acceptability of welds during pro- <br /> (c) effective throat: the minimum distance,minus any duction welding <br /> reinforcement (convexity), between the weld root and weld coupon examination: see para. U344.8.1. <br /> the face of a fillet weld weld reinforcement: weld material in excess of the speci- <br /> toe of weld: the junction between the face of a weld and fied weld size. <br /> the base material. welder: one who performs a manual or semi-automatic <br /> tube: see pipe. welding operation. (This term is sometimes erroneously <br /> used to denote a welding machine.) <br /> tungsten electrode:a nonfiller-metal electrode used in arc welding or cutting, made principally of tungsten. welding operator:one who operates machine or automatic <br /> welding equipment. <br /> unbalanced piping system: see para. 319.2.2(b). welding procedure: the detailed methods and practices <br /> undercut:a groove melted into the base material adjacent involved in the production of a weldment. <br /> to the toe or root of a weld and left unfilled by weld welding procedure specification (WPS): the document that <br /> material. lists the parameters to be used in construction of weld- <br /> visual examination: see para. 344.2.1. ments in accordance with requirements of this Code. <br /> weldment: an assembly whose component parts are <br /> weld:a localized coalescence of material wherein wales- joined by welding. <br /> cence is produced either by heating to suitable tempera- <br /> tures,with or without the application of pressure,or by 300.3 Nomenclature <br /> application of pressure alone, and with or without the Dimensional and mathematical symbols used in this <br /> use of filler material. Code are listed in Appendix J,with definitions and loca- <br /> weld coupon: a sample weld used to determine weld tion references to each.Uppercase and lowercase English <br /> acceptance. Types of weld coupons are defined as letters are listed alphabetically, followed by Greek <br /> follows: letters. <br /> (a) primary weld coupon: made prior to the start of 300.4 Status of Appendices <br /> production welding to establish a benchmark of weld Table 300.4 indicates for each Appendix of this Code <br /> acceptance whether it contains Code requirements, guidance, or <br /> (b) production weld coupon: made when any of the con- supplemental information. See the first page of each <br /> ditions in para. U341.4.5 exist and used to compare Appendix for details. <br />