Copper is one of the most commonly used materials for welding. Copper and copper alloys have good electrical and thermal conductivity, good corrosion resistance, wear resistance and thermal shock resistance, so they are widely used in aerospace, vehicle and shipbuilding, machinery manufacturing and other fields. Therefore, the proper welding and selection of welding materials are essential.
The welding materials for copper and copper alloys include welding rods, welding strips, and other welding consumables. According to the type of alloying element and the state or shape of the alloy, they can be divided into lead-tin alloys, phosphorus-copper-tin alloys, tin-zinc alloys, high-copper alloys, high-temperature alloys, low-temperature alloys, cast alloys, etc. The design of welding materials should be based on the material and heat treatment requirements of the welded parts, as well as operating conditions such as joint shape, welding position and required service life.
There are many types of copper welding rods. Commo types include:
1. ZJ416: It is a tin-copper alloy welding wire for low temperature brazing with a melting point of 416℃.
2. ZJ502: It is a tin-phosphorus copper welding wire for low temperature brazing, with a melting point of 502℃.
3. ZCu-B: It is a high-copper alloy flux-cored wire for argon arc welding, with a deposited efficiency of 95%.
4. ZJ-708: It is a copper-tin alloy welding rod for titanizing, with a melting point of 708℃.
5. ZL-30: It is a high-copper alloy welding wire for stainless steel based materials.
The welded joint of copper and copper alloy should meet the requirements of weld macrostructure, grain size, porosity, cracking and other performance indicators. The welding options of copper and copper alloys include manual welding, automatic welding, argon arc welding, submerged arc welding, oxy-acetylene welding and welding with other materials such as copper and copper alloy carbon steel.
The main components of copper and copper alloy weld joints include copper, zinc, tin, phosphorus and other elements. According to the amount of alloying elements, the copper-tin alloy welded joints can be divided into three types: pure copper, tin-zinc alloy and tin-phosphorus-copper alloy. The service life and performance of welded joints depend on the composition, content, form and type of en do are materials used.
In conclusion, when selecting the welding materials for copper and copper alloys, it is necessary to understand and master their welding technology. Choose the right material according to the material, heat treatment requirements, welding position and other parameters of the welded parts. In addition, attention should be paid to the selection and application of welding filler metals according to the melting point, strength, toughness and other performance indicators, so as to ensure the performance of the welded joints and meet the needs of engineering use.
