IEC 60974-13 pdf free download
IEC 60974-13 pdf free download.Arc welding equipment – Part 13: Welding current return clamp.
The heated rod in a horizontal position is then applied for 2 mm to the insulation. The heated rod shall not penetrate through the insulation and contact live parts.
An attempt is made to ignite any gases which may be emitted in the region of the contact point by means of an electric spark or small flame. If the gases are flammable, the burning shall stop as soon as the heated rod is removed.
9 Mechanical requirements
9.1 RETAINING MEANS
A WELDING CURRENT RETURN CLAMP shall be designed to maintain sufficient electrical contact in normal service and to prevent the unintentional separation of the WELDING CURRENT RETURN CLAMP as a result of a longitudinal pull.
Where springs are incorporated in the WELDING CURRENT RETURN CLAMP, they shall not constitute part of the current path unless they are permanently by-passed by a fixed conductor capable of carrying the test current given in Table 1.
Conformity shall be checked by visual inspection and the following test:
A WELDING CURRENT RETURN CLAMP is fitted in accordance with the manufacturer’s instructions, with a welding cable of maximum cross-sectional area 5 m length and its coupling device. The welding cable is folded to form a bundle not exceeding 0,4 m in length. The clamp is attached to a clean mild steel plate 3 mm thick. The steel plate is positioned such that the cable bundle applies a vertical longitudinal force on the clamp for 1 mm.
Test is passed if the WELDING CURRENT RETURN CLAMP remains attached to the steel plate.
9.2 Welding cable entry
The cable entries of the WELDING CURRENT RETURN CLAMP shall be designed so as to prevent damage to the cable due to flexing.
Conformity shall be checked by visual inspection.
9.3 Welding cable connection
The design of the WELDING CURRENT RETURN CLAMP shall be such that welding cables with a cross-sectional area within the range as specified by the manufacturer can be replaced. The connection shall withstand the mechanical stress of the following tensile test without separation. A clamp may be provided with adaptor to enlarge the fitting range.
Conformity shall be checked by visual inspection and by the following test:
A WELDING CURRENT RETURN CLAMP is fitted in accordance with the manufacturer’s instructions, with a welding cable of maximum cross-sectional area. The connection is subjected to 10 pulls with a force of 40 N per mm2 of the cross-sectional area with a maximum of 2 000 N applied to the welding cable. The force of each pull is gradually increased from zero to the specified value in 1 s and maintained for 1 5.
After the test, the conductor shall not have been displaced by more than 2 mm.
This test shall be repeated with a welding cable having the minimum permissible cross-sectional area as specified by the manufacturer.
9.4 Drop withstand
The WELDING CURRENT RETURN CLAMP shall be capable of withstanding a drop test without
impairing the mechanical functioning.
Conformity shall be checked by the following test, manual operation and visual inspection.
Lift the WELDING CURRENT RETURN CLAMP without any cable fitted to a height of 5 m above a 10 mm thick steel plate, release without initial velocity and allow to fall on the steel plate. Repeat this procedure 10 times with the clamp in various initial orientations to ensure each side and edge is tested.IEC 60974-13 pdf download.
