How to prevent welding accidents
19 Oct 2020
There are many reasons for fire and explosion accidents during welding. First is that sparks, molten metal and red hot particles of molten slag splash around during welding, which ignite the surrounding flammable and explosive materials and cause fire and explosion; Second is that the cord of the electric welding machine is dragged on the ground for a long time, resulting in damage, rupture, and short circuit, causing a fire; Third is the random connection of the electric welding ground wire causing fire; Fourth, the welding machine itself and the power cord are damaged at all times, causing short-circuit heat and fire; Fifth, when welding and repairing a container with flammable and explosive materials, the container was heated and exploded due to uncleaned replacement welding. In addition, welding in flammable and explosive warehouses can also cause explosion accidents because feasible preventive measures are not taken. Therefore, the following preventive measures should be strengthe...
Protection of welders in welding production
13 Oct 2020
1. Prevent the hazards of dust and harmful gases in the welding production process The high temperature of the welding arc will cause the metal to evaporate violently. The welding rod and base metal will also produce metal gas and smoke during welding, which condense in the air and oxidize into dust; the radiation generated by the arc acts on the oxygen and nitrogen in the air, which will produce Harmful gases such as ozone and nitrogen oxides. The amount of dust and harmful gases is related to the welding parameters and the types of welding materials. For example, when welding with alkaline electrodes, the harmful gases produced are higher than those with acid electrodes; in gas shielded welding, because the shielding gas can dissociate under the action of arc high temperature, gas that affects the human body; if the electrode is used as thorium tungsten, thorium has a certain If the radioactive welding dust and harmful gases exceed a certain concentration, and the workers work under ...
The development trend of welding technology
09 Oct 2020
The development level of welding technology is one of the signs of the development level of a country's machinery manufacturing and science and technology. The current development trend of welding technology has the following characteristics: ⑴ With the continuous emergence of new welding materials and structures, it is necessary to develop new welding process methods. ⑵ Improve the commonly used common welding process methods, improve the mechanization and automation level of the welding process, and improve the welding quality and productivity. ⑶ Use electronic computers to control the welding process, and vigorously promote welding robots and welding centers. ⑷ Develop special complete sets of welding equipment. The following introduces some mature welding technologies: 1. Ultrasonic welding [Ultrasonic welding] refers to a pressure welding method that uses the high-frequency oscillation of ultrasonic waves to locally heat and clean the surface of the workpiece joint, and then apply...
How to choose welding process parameters
27 Sep 2020
Spot welding machine e-book welding process parameters mainly include electron beam current, accelerating voltage, welding speed, focusing current and working distance. Generally speaking, penetration is directly proportional to acceleration voltage and beam current, and inversely proportional to beam spot diameter, working distance, and welding speed. The increase in acceleration voltage can increase the penetration depth. Under the condition of keeping other parameters unchanged, the cross-sectional aspect ratio of the weld is proportional to the acceleration voltage. Increasing the electron beam current will increase the penetration depth and penetration width. Increasing the welding speed will narrow the weld and reduce the penetration depth. The focus state of the electron beam has a great influence on the penetration depth and weld formation. A smaller focus can narrow the weld and increase the penetration depth. For different equipment, welding the same part, due to the differen...
What is the scope of application of cold welding repair machine for butt welding machine
21 Sep 2020
Scope of cold welding repair machine for butt welding machine: Cold welding repair machine is a professional precision repair welding equipment for casting pinholes, sand holes, pores, cracks, bumps, scratches, pits, surface wear of mechanical parts, mold wear and other small defects . It is widely used in mold industry, foundry industry, electrical appliance manufacturing industry, medical equipment, automobile, shipbuilding, boiler, construction, bridge construction and other industries. 2. Applicable materials for cold welding repair machine: The cold welding repair machine uses ordinary welding wire as the repair material. The materials are: gray iron, ductile iron, stainless steel, carbon steel, die steel, aluminum, aluminum alloy, copper, etc., as long as it is conductive metal Can be patched. Spot welding machine welding is flexible, simple, convenient, firm and reliable. Automatic welding machine welding is an electrical appliance that supplies power with certain characteristic...
The principle, characteristics and application scope of common welding methods
15 Sep 2020
Gas welding principle of spot welding machine Use the flame heat of combustible gas and oxygen to melt the weldment and welding wire for welding. Features: Flame temperature and nature can be adjusted, heat is not concentrated enough, heat affected zone is wider, and productivity is low. Scope of application: Used for welding thin plate structures or small parts. Weldable steel, cast iron, aluminum, copper and its alloys, cemented carbide, etc. Principle of electrode arc welding Use the arc heat between the electrode and the weldment to melt the electrode and the weldment for welding. Features: Exciting, flexible, adaptable, and can be welded in all positions. The beam spot is simple and durable, and the maintenance cost is low. The labor intensity is high, and the welding quality is affected by the skill level of the workers and is unstable. Scope of application: It is the most practical in single-piece, small batch production and maintenance. It can weld carbon steel, low-alloy steel...