Outline
Welding operations are special operations, the operation of the operating personnel training and qualification are the strict system of examination and evidence collection. Although trained in evidence when replacement mastered certain skills, but there are still a lot of welders in the welding work in safety consciousness, often violated "safe operation" of unsafe behavior. Since the majority of welders and electrical expertise is limited knowledge of safe use of electricity, resulting in more welding work-site accidents, such as welding enclosure is not grounded or grounding is not reliable, are not required to do the bare terminal insulated handle, solder the bare wire connectors conductor insulation is not required to do processing, welding the wire soaked in water and so on. Thus, the elimination of welding work site accidents each welder should have the skills. During the operation not only to ensure their personal safety, but also to ensure the safety of others, welders in the welding work must do the following preventive measures [1].
The use of qualified welding tool
Pre-operational welding tool should be carefully checked, check the following items: 1. Welding Wire  insulation performance is good; 2 Lead welding power cord and whether the damaged insulation aging, the case of bare wire; 3 Welding I, II second side of the terminal loose, severe burns of the situation; 4 special welding clamp and welding gloves for damage possible leakage, the failure prohibited.
Wiring program
1 Select a well-insulated lead wire and solder the wire (electrode holder lead) and reliable connection, tighten the connector to make good contact, to prevent overheating, and the connection with insulating tape wrapped several layers of conductors exposed to good insulation. (2) Lead will be laid and connected to the welding machine welding machine at the terminal on the secondary side, it should be pressed firmly screw good contact, prohibit the use of winding method to connect. Avoid laying Lead solder joints from the water, especially after the place, if necessary overhead. After welding the metal railing or ladder line, the application of good insulation string to hang. 3 welding metal will be grounded. Namely: one end of wire with a grounding grid, the other end connected to the CO2 Welding Wire Manufacturers enclosure marked on the ground marks and tighten the screw to be grounded to prevent electric shock caused by the live shell. 4. The power cord connected to one side of the terminal welding, clamping screw to secure good contact, prohibit the use of winding method to connect. 5. The power cable, welding cable connector and the insulation aging wrap with insulating tape breakage, wire insulation is aging and those who prohibit the use, exposed terminal guard should be added to prevent the misuse of electric shock hit. 6 Check with a knife or with a fuse of the power fuse circuit breaker in the off position, the power cord to the power switch under the side of the fuse or fuses, electric wiring is prohibited. 7. Once again the power cord, pin-out, carefully check the ground wire enclosure, after confirmation on the power switch, combined switch should wear insulated gloves and other hand may not touch the welder.
Principle of electric shock
Case is not grounded: in the welding machine welding machine housing will damage the insulation with a voltage, if the time someone hit a welding enclosure, the body and the earth and the power neutral ground wire work (three-phase four-wire system the neutral point usually ground) constitute a loop, as shown in dotted lines with arrows above figure, the current will cause an electric shock through the body. Shell ground situation: welding machine welding machine live shell insulation damage, the welder case by case directly with the earth ground wire connected to form a short circuit (such as the figure above the dotted line without the arrow), this power will short-circuit current protection device (automatic switch, fuse or fuse) action, so that welding power supply is disconnected. Power is not cut off before the case even if someone access to welding, due to the resistance of shell grounding line is almost zero, almost no current through the body, may also play a role in protecting personal safety. 1, into metal containers, underground, trench, etc. operations, is strictly prohibited welding and lighting of the lamp transformer into the line, to prevent a voltage caused by electric shock. 2, in particular the replacement of electrodes during the operation must be required to wear welding gloves. 3, operation in wet conditions should wear insulated shoes or standing on dry wood. Clothes, work shoes, gloves to keep dry in order to ensure insulation does not decrease. 4, remove the power cord, failure to eliminate welding, mobile welding machines and welders to leave the scene, remember the power switch off. 5, lack of welding operations on-site lighting should be used when running lights, prohibit the use of 220V lights, or metal container in the humid environment, the line used in the lamp voltage must not exceed 12V. 6, Yu Xuetian must be carried out welding work in the outdoor open-air, we must take measures to prevent rain and snow (such as anti-canopy, etc.), to prevent rain water welding, and welding the wire, resulting in leakage injury accident.

MCC-owned China Metallurgical Construction Research Institute Co., Ltd. "-70 ℃ low temperature steel electrodes W707Ni with the development" through appraisal.

Low temperature steel Welding Wire is low-temperature equipment, cryogenic storage tank area with one of the main varieties of welding consumables, welding area is high-end products. In order to change our long-standing dependence on imports of such electrodes over the situation, in Yejian research tackling the technology more than two years to complete the -70 ℃ low temperature steel electrodes W707Ni with the development.

Appraisal meeting, listen to the report by the Expert Committee, question the respondent and rigorous evaluation, agreed that: the Yejian research "-70 ℃ low temperature steel welding rod W707Ni" compared with similar products, with excellent low temperature impact resistance of -70 ℃, good low temperature crack resistance, fracture mechanics performance and innovation in NDTT (non-plastic transition temperature) indicators, has reached the advanced level of similar products.

The technical results related products to fill the domestic blank, the field of Cast Iron Welding Wire at low temperatures have great promotional value.