Electric pressure welding machines

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ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING
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Section 7. Electrical equipment of special installations

Electrical installations. Electric pressure welding machines

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Encyclopedia of radio electronics and electrical engineering / Rules for the installation of electrical installations (PUE)

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7.6.62. The width of the passages between the machines of spot, roller (linear) and relief welding, when they are located opposite each other, must be at least 2 m, and between the butt welding machines - at least 3 m. less than 1 m, when located on the front and back sides - at least 1,5 m.

7.6.63. Fusion resistance welding machines must be equipped with protective devices (protecting operating personnel from splashes of metal and sparks and allowing safe observation of the welding process), as well as devices for intensive local exhaust ventilation.

7.6.64. To supply welding current to special mobile or suspended resistance welding machines used for welding bulky structures in hard-to-reach places, a flexible hose cable (wire) with insulation and a sheath made of flame-retardant material with air, and in justified cases - with water cooling should be used.

7.6.65. The open-circuit voltage of the secondary winding of the welding transformer of the contact welding machine at the rated mains voltage should not be higher than 50 V.

7.6.66. Suspended spot and roller welding machines with built-in welding transformers must be connected to the network through a separating transformer and have a lock that allows the power circuit to be turned on only when the machine body is grounded.

It is allowed to directly connect the welding transformer (without a separating transformer) to a network with a voltage of not more than 380 V, while the primary circuit of the built-in transformer must have double (reinforced) insulation or the machine must be equipped with a residual current device.

7.6.67. In suspended spot and roller welding machines, the voltage of the control circuits located directly on the welding tongs must not exceed 50 V for AC circuits or 110 V for DC circuits.

As an exception, the voltage of these circuits is allowed up to 220 V AC or DC in the presence of double insulation of control circuits, as well as grounding elements or a residual current device.

The current supply in such machines to welding tongs is recommended to be carried out with a water-cooled wire.

See other articles Section Rules for the installation of electrical installations (PUE).

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