IEC 60974-7-2005 pdf – Arc welding equipment – Part 7: Torches.
1 Scope This part of IEC 60974 specifies safety and construction requirements for torches for arc welding and allied processes. In this part of IEC 60974, a torch consists of the torch body, the cable-hose assembly and other components. This part of IEC 60974 is not applicable to electrode holders for manual metal arc welding or torches for air-arc cutting/gouging. NOTE In this part of IEC 60974, the terms “torch” and “gun” are interchangeable. For convenience “torch” has been used in the following text. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. IEC 60050(151), International Electrotechnical Vocabulary (IEV) – Part 151: Electrical and magnetic devices IEC 60050(851), International Electrotechnical Vocabulary (IEV) – Chapter 851: Electric welding IEC 60529, Degrees of protection provided by enclosures (IP Code) IEC 60664-1, Insulation coordination for equipment within low-voltage systems – Part 1: Principles, requirements and tests IEC 60974-1:2005, Arc welding equipment – Part 1: Welding power sources IEC 60974-2, Arc welding equipment – Part 2: Liquid cooling systems 3 Terms and definitions For the purposes of this document, the terms and definitions given in IEC 60050(151), IEC 60050(851), IEC 60664-1, and IEC 60974-1, as well as the following, apply. NOTE Additional terminology is given in Annex A. 3.1 torch device that conveys all services necessary to the arc for welding, cutting or allied processes (for example, current, gas, coolant, wire electrode)
3.2 gun torch with a handle substantially perpendicular to the torch body 3.3 torch body main component to which the cable-hose assembly and other components are connected 3.4 handle part designed to be held in the operator’s hand 3.5 gas nozzle component at the exit end of the torch directing the shielding gas around the arc and over the weld pool 3.6 non-consumable electrode arc welding electrode which does not provide filler metal 3.7 wire electrode solid or tubular filler wire which conducts welding current 3.8 contact tip replaceable metal component fixed at the front end of the torch, which transfers the welding current to, and guides, the wire electrode 3.9 cable-hose assembly flexible assembly of cables and hoses, and their connecting elements, that delivers all necessary supplies to the torch body 3.10 manual torch torch held and guided by the operator’s hand during its operation 3.11 mechanically guided torch torch fixed to, and guided by, a mechanical device during its operation 3.12 air-cooled torch torch cooled by the ambient air and, where appropriate, by the shielding gas 3.13 liquid-cooled torch torch cooled by the circulation of a cooling liquid 3.14 motorized torch torch incorporating means to supply motion to the wire electrode
3.15 spool-on torch motorized torch incorporating a filler wire supply 3.16 arc striking and stabilizing voltage voltage superimposed on the welding circuit to initiate or maintain the arc or both 3.17 filler metal metal added during welding or allied processes [IEV 851-04-24] 3.18 filler wire filler metal in solid or tubular wire form which may or may not be part of the welding circuit 3.19 plasma tip component that provides the constricting orifice through which the plasma arc passes 3.20 visual inspection inspection by eye to verify that there are no apparent discrepancies with respect to the provisions of the standard concerned [IEC 60974-1, 3.7] 3.21 plasma cutting system combination of power source, torch, and associated safety devices for plasma cutting/gouging 3.22 plasma cutting power source equipment for supplying current and voltage and having the required characteristics suitable for plasma cutting/gouging and which may supply gas and cooling liquid NOTE A plasma cutting power source may also supply services to other equipment and auxiliaries, for example auxiliary power, cooling liquid, and gas. [IEC 60974-1, 3.55]