Matters needing attention in the safe use of welding tools? Technical disclosure of welder's construction safety

Precautions for Safe Use of Welding Tools Technical Disclosure of Welder's Construction Safety

(1) Before welding, first check whether the welding machine and tools are in good condition and reliable. For example, whether the insulation between the electrode holder and the welding cable is damaged, and whether the grounding of the welding machine shell is in good contact with all wiring points of the welding machine. No work shall be started without safety inspection.

(2) When working in narrow spaces, boathouses, containers and pipelines, insulating shoes must be worn to prevent electric shock, and rubber sheets or other insulating village mats must be placed under the feet; They'd better take turns to work in order to take care of each other. Otherwise, it is necessary to have a guardian to pay attention to the safety of the operator at any time, and cut off the power supply immediately for rescue in case of danger.

(3) When the clothes are wet after sweating, don't lean on the charged steel plate or workpiece to prevent electric shock.

(4) When the workplace is wet, the ground should be covered with rubber sheets or other insulating materials.

(5) Replace covered electrode with leather gloves, and do not operate with bare hands.

(6) During live working, for the sake of safety, the electrode holder shall not be clamped under the armpit to move the workpiece to be welded or the welding cable shall be hung around the neck.

(7) When pushing the switch knife switch, the face is not allowed to face the switch, so as to prevent the sparks generated by short circuit from burning the face.

(8) The following operations can only be carried out after the power supply is cut off:

When replacing the welding machine joint; When it is necessary to connect the secondary circuit to replace the weldment; When replacing the safety device; When the welding machine fails and needs maintenance; When the welding machine is removed from the working place; When you finish your work or leave the job site temporarily.

Safety requirements for welder construction

1. Safety requirements for welding tongs and welding guns

(1) is light in structure and easy to operate. The weight of hand arc welding tongs shall not exceed 600g, and national standard products shall be adopted.

(2) Good thermal insulation performance and thermal insulation capacity. The handle should have a good heat insulation layer to prevent it from getting hot and hot. The welding torch head of gas shielded welding shall be protected by heat insulation material. The joint of the electrode holder from the clamping rod to the handle. The spacing is150 mm.

(3) The connection between electrode holder and welding gun and cable must be simple and reliable, and the joint shall not be exposed to prevent electric shock.

(4) The plasma torch shall ensure that the water cooling system is sealed. No air leakage, no water leakage

(5) The hand arc electrode holder should be able to ensure that the covered electrode can be clamped at any inclination, which is convenient for replacement.

2. Welding cable safety requirements

The welding cable is an insulated wire connecting the welding machine, electrode holder (gun) and weldment, and shall meet the following safety requirements:

(1) The welding cable shall have good conductivity and insulating outer layer. Generally, it is made of copper core (multi-strand thin conductor) wrapped with rubber insulating sleeve, and the insulation resistance is not lower than 1Mn.

(2) It is light and flexible, can be bent and twisted at will, and is easy to operate.

(3) Welded cables shall have good mechanical damage resistance, oil resistance, heat resistance and corrosion resistance.

(4) The length of welding cable shall be determined according to specific conditions. If it is too long, the pressure drop increases, and if it is too short, it is inconvenient to work. Generally, the cable length is 20-30m.

(5) It has an appropriate cross-sectional area. The cross-sectional area of welding cable should be selected according to welding current. To ensure that the conductor will not overheat and burn the insulation layer. Refer to the specific provisions of cable section and maximum current.

(6) Welding cables shall be used as a whole, and there shall be no joint in the middle. If it is necessary to use short wires for extension, the number of joints shall not exceed 2. When the cable is extended, it should be firmly connected with the connector, and the joint should be well insulated.

(7) It is forbidden to use the metal institutions, pipes, tracks or other metal laps in the workshop as wires.

(8) The welding cable shall not be placed next to the hot welding metal near the arc to avoid burning the insulation layer. At the same time, rolling wear should be avoided. Welding cables are prohibited from contacting flammable substances such as oil and grease.

(9) Copper (or aluminum) wire nose must be used for the connection between welding cable and welder, so as to avoid the secondary terminal board burning out and causing fire.

(10) The insulation of welding cables should be checked regularly every six months.

(1 1) Due to the high voltage, the length of the power cord connected between the welder and the switchboard shall not exceed 3m except for good insulation. If long wires are really needed, interval safety measures should be taken, that is, porcelain bottles should be laid along the wall above 2.5m from the ground. It is forbidden to lay the power cord along the ground, and don't fall into muddy water.

3. Safety requirements for the use of welding tools

In order to prevent electric shock accidents, in addition to wearing protective overalls, protective gloves and insulating rubber shoes as required, it should be dry and clean. In the process of operation, we should also pay attention to the following aspects.

(1) Before welding, first check whether the welder and tools are in good condition, safe and reliable. For example, whether the insulation between the electrode holder and the welding cable is damaged, whether the welding machine shell is grounded, and whether the welding machine connection point is in good contact. No work shall be started without safety inspection.

(2) When working in a narrow space, a boathouse, a container or a pipeline, insulating shoes must be worn to prevent electric shock, and rubber sheets or other insulating pads must be placed under the feet; They'd better take turns to work in order to take care of each other. Otherwise, it is necessary to have a guardian to pay attention to the safety of the operator at any time, and cut off the power supply immediately for rescue in case of danger.

(3) When the clothes are wet after sweating, don't lean on the charged steel plate or workpiece to prevent electric shock.

(4) When the workplace is wet, the ground should be covered with rubber sheets or other insulating materials.

(5) Replace covered electrode with leather gloves, and do not operate with bare hands.

(6) During live working, for the sake of safety, the electrode holder shall not be clamped under the armpit to move the workpiece to be welded or the welding cable shall be hung around the neck.

(7) When pushing the switch knife switch, the face is not allowed to face the switch, so as to prevent the sparks generated by short circuit from burning the face.

(8) The following operations can only be carried out after the power supply is cut off:

When replacing the welding machine joint; When it is necessary to connect the secondary circuit to replace the weldment; When replacing the safety device; When the welding machine fails and needs maintenance; When the welding machine is removed from the working place; When you finish your work or leave the job site temporarily.

Welder's technical disclosure:

1. Preparation before construction:

1. 1 Installation Check whether the electrical circuit and welder are in good condition.

1.2 Select the welding machine and operation site in a dry place.

2. Key points of operation process:

2. 1 Welders must receive professional training, be familiar with the structural performance, operation methods and maintenance methods of welding machines, and hold relevant certificates after passing the examination.

2.2 Before welding, check whether all tools, welding machines, switches and lines are in good contact, whether the insulation of welding wire (positive wire) and grounding wire (negative wire) is in good condition, and it is not allowed to contact acetylene gas pipe and oxygen gas pipe, whether the welding machine sheath grounding is in good condition, all wires must be tightly and firmly pressed, and lightning protection grounding wire shall not be used as sheath grounding wire. Under the welding machine, there must be a wooden pad separated from the ground, and the insulation degree of welding tools (welding machine, switch, rubber wire and electrode holder, etc.) should be checked. ) check it regularly.