Key points of safe operation of electric welding

The main points of safe operation of welding are as follows:

1. Check the safety of welding equipment and tools before starting the work of welding. Inspection contents include whether the welder casing is grounded or connected with zero wire, whether the connection is reliable, whether the contact of the welding line is good, whether the insulation of the welding cable is damaged, whether the welding machine and torch supply gas, water supply system has leakage, leakage phenomenon, etc. After normal operation, welding operation can not be started without permission. For example, there is an electric welder in a factory who hasn't made a safety check after work, because the welder hasn't been connected to the ground wire after overhaul. During operation, the welder is not well maintained, the insulation is damaged, and the shell is leakage. When he adjusts the welding current and grasps the handle, he is shocked.

2. Pay attention to the direction of welding current. The operator must be careful not to make himself, the transmission parts of machinery and equipment and animals become welding circuits under any circumstances, in order to prevent welding current from causing injury accidents. For example, in a cattle farm, 120 cows are tied to an iron pipe by a chain. When the welder welds the iron pipe, one end of the secondary winding of the arc welding transformer is connected to the tap of the water pipe. During welding, current flows through iron pipes, chains, bovine bodies, cement floors and water pipes to form a closed circuit, and the welding current kills all cows. For example, when a factory is repairing and repairing the pipe of a water pump, the welder connects one end of the secondary circuit to the ground line of the motor, and the current of about 400 amperes passes through the base, gear, pump body and water pipe of the motor, and then to the electrode, resulting in the equipment accident that the gears are welded (due to the resistance heat generated at the contact of the gear teeth), because it is not there. The spare parts were forced to stop for several weeks. Another example is a welder sitting on a metal frame after dinner resting, and arc welding transformer secondary circuit end connected to the metal frame, the welder's hand holds the welding clamp, with a burning red electrode cigarette, welding current through the human body, by electric shock, people fall from high.

Three. The operation that should be cut off: the following operation should be cut off by power supply.

1. change the joint of the welder.

2. transfer the work place to move the welder;

3. the replacement of weldments should be replaced with two circuits.

4. replace the fuse;

5. work or temporarily leave the job site;

6. failure of welding machine needs to be repaired.

Push and pull the switch knife, must wear leather gloves, head deflection, eyes do not look straight, to prevent electric spark or arc burns on the face.