![]() 3.2.9 mechanized welding: A process where parame- ters and torch guidance are controlled mechanically or elec- tronically but may be manually varied during welding to maintain the specified welding conditions. The magnitude of concav- ity is the perpendicular distance between an axial extension of the pipe wall surface and the lowest point on the weld bead surface. 3.2.8 internal concavity: A bead that is properly fused to and completely penetrates the pipe wall thickness along both sides of the bevel, but whose center is somewhat below the inside surface of the pipe wall. 3.2.7 indication: Evidence obtained by nondestructive testing. 3.2.6 imperfection: A discontinuity or irregularity that is detectable by methods outlined in this standard. 3.2.5 defect: An imperfection of sufficient magnitude to warrant rejection based on the stipulations in this standard. 3.2.4 contractor: Includes the primary contractor and any subcontractors engaged in work covered by this standard. The company may act through an inspector or another authorized representative. 3.2.3 company: The owner company or the engineering agency in charge of construction. 3.2.2 branch weld: The completed groove and/or fillet weld joining a set on or set in branch pipe or a set on or set in branch fitting to a run pipe. 3.2 DEFINITIONS 3.2.1 automatic welding: Arc welding with equipment that performs the entire welding operation without manual manipulation of the arc or electrode other than guiding or tracking and without a manual welding-skill requirement of the operator. It is intended that all work performed in accordance with this standard shall meet or exceed the requirements of this standard.ģ.1 GENERAL The welding terms used in this standard are as defined in AWS A3.0, with the additions and modifications given in 3.2. Types of weld imperfections and their proposed accep- tance limits. Persons who wish to have other processes included shall submit, as a minimum, the fol- lowing information for the committee’s consideration: a. ![]() ![]() Processes other than those described above will be consid- ered for inclusion in this standard. Each system is to be used independently of the other, without combining values in any way. The values stated in either inch-pound units or SI units are to be regarded separately as standard. This standard also covers the procedures for radiographic, magnetic particle, liquid penetrant, and ultrasonic testing, as well as the acceptance standards to be applied to production welds tested to destruction or inspected by radiographic, magnetic particle, liquid penetrant, ultrasonic, and visual test- ing methods. The welds may be produced by position or roll welding or by a combination of position and roll welding. The welding may be done by a shielded metal-arc welding, submerged arc welding, gas tungsten-arc welding, gas metal-arc welding, flux-cored arc welding, plasma arc welding, oxyacetylene welding, or flash butt welding process or by a combination of these processes using a manual, semi- automatic, mechanized, or automatic welding technique or a combination of these techniques. It applies to both new construction and in-service welding. This standard covers the gas and arc welding of butt, fillet, and socket welds in carbon and low-alloy steel piping used in the compression, pumping, and transmission of crude petro- leum, petroleum products, fuel gases, carbon dioxide, nitro- gen and, where applicable, covers welding on distribution systems. API STD 1104 pdf download.Welding of Pipelines and Related Facilities
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