Many people in the purchase of laser cutting machine or second-hand laser cutting machine, do not know how to judge the quality of laser cutting machine processing. Especially when purchasers of second-hand laser cutting machine choose laser equipment, they are often blindly, sometimes overlooking more important quality standards. Metal laser cutting machine, as an efficient…
The deposited metal welded with alkaline electrode by manual arc welding has good mechanical properties and crack resistance, so it is widely used in the welding of alloy steel and important carbon steel structure. Alkaline electrode is also called low hydrogen electrode because the hydrogen content of the deposited metal is the lowest among all…
AC welding machine is a special structure of step-down transformer, no-load voltage is 60-80V, working voltage is 30V; power 20-30kW, secondary current is 50-450A; power supply voltage 380/220 V. DC welding machine uses a three-phase motor to drive a special structure of the DC generator; silicon rectifier DC welding machine is the use of silicon…
DC welding power source is usually used in gas shielded arc welding. At present, the arc welding rectifier DC power source is widely used in production. In recent years, the inverter arc welding power source has developed rapidly. The rated power of welding power depends on the current range required for various uses. The current…
Causes of fire and explosion in welding and hot cutting operations Welding and hot cutting operations refer to the use of welding or hot cutting methods for the processing of materials, in the process of operation may trigger fire and explosion of the main reasons include: 1, the workplace is not isolated from inflammable and…
Sulfur is the most strongly promoting element of cast iron welds to produce white tissues. Sulfur not only enhances the binding force of iron and carbon atoms, but also forms sulfides which distribute at grain boundaries, hindering the diffusion and precipitation of carbon. Especially for ductile iron, many research results show that sulfur is a…
Bronze with tin as the main alloying element. Tin content is generally between 3 and 14%, mainly used for making elastic parts and wear resistant parts. The tin content of the modified tin bronze is not more than 8%, sometimes adding phosphorus, lead, zinc and other elements. Phosphorus is a good deoxidizer, and it also…
1, multi pass welding: more than two welding passes to complete the welding of the whole weld. Multilayer welding: deposited more than two welding layers to complete the welding of the whole weld. Multi-layer welding includes multi-layer single pass welding and multi-layer multi-pass welding, a layer of weld can be composed of a number of…
Difference between brass and Nickel copper Brass is an alloy composed of copper and zinc. If brass is made of copper and zinc, it is called ordinary brass. If the alloy is made up of more than two elements, it is called special brass. Such as copper alloy consisting of lead, tin, manganese, nickel, lead,…
(1) Phosphor bronze, a copper based alloy with tin as the main alloy element, is called tin bronze. The tin content of tin used in industry is mostly between 3% and 14%. Tin bronze with tin content less than 5% is suitable for cold working; tin bronze with tin content between 5% and 7% is…
