DC AC arc Welding Plant

• DC or AC arc welding plant shall be used Instruments, cables and the accessories shall conform to the requirements of the relevant Indian Standards wherever available


• Their capacity shall be adequate for the Welding procedure laid down. All welding plants shall be maintained in good working order.

• The arc shall be struck on the points/crossing and then the electrodes shall be progressively advanced by maintaining the arc using uniform movement.

• Means for measuring the current (tong tester) shall be available in addition to the current setting panel integrated with the welding plant.

• The actual output of welding current may not be equal to the current as set on the control panel in many cases, specially when the plant becomes old.

• The current range as recommended by the manufacturer for the particular brand of electrode selected for welding shall be used.

• All electrical appliances required with the welding plant shall be properly earthed.

• The points and crossings shall be pre-heated by oxyacetylene films to a temperature between 250 degree centigrade to 300 degree centigrade before welding.

• This temperature shall be maintained throughout the welding operation.

• If welding is to be interrupted for some reason, then the portions to be reclaimed subsequently shall be pre-heated again to the above temperature range before welding as continued.

• The pre-heating and inter pass temperature shall be measured either by contact type pyrometer or tempil stick. No post heat-treatment is required after welding.