IEC 60974-7 pdf download

IEC 60974-7 pdf download Arc welding equipment – Part 7: Torches
1 scope
This part of lEC 60974 specifies safety and construction requirements for torches for arcwelding and allied processes.
In this part of lEC 60974, a torch consists of the torch body, the cable-hose assembly andother components.
This part of lEC 60974 is not applicable to electrode holders for manual metal arc welding ortorches for air-arc cutting/gouging.
NOTE In this part of lEC 60974, the terms “torch”and “gun”are interchangeable.For convenience “torch” hasbeen used in the following text.
2Normative 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 editionof the referenced document (including any amendments) applies.
IEC 60050(151)，International Electrotechnical Vocabulary (IEV) – Part 151: Electrical andmagnetic devices
IEC 60050(851)，International Electrotechnical Vocabulary (IEV) – Chapter 851: Electricwelding
IEC60529,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 sourcesIEC 60974-2,Arc welding equipment – Part 2: Liquid cooling systems
3Terms and definitions
For the purposes of this document,the terms and definitions given in IEC 60050(151),IEC 60050(851), IEC 60664-1, and lEC 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