What are the process requirements for welding brass?

【Summary Description】 Welded brass What is the reason why argon arc welding brass has pores? What are the process requirements for argon arc welding brass? 1. The oxide, oil and other dirt on the welding edge of the workpiece and the surface of the welding wire must be removed before welding, otherwise it will cause defects such as pores and slag inclusion, which will reduce the performance of the weld. 2. When argon arc welding brass or bronze, because the melting point of the parent body itself is relatively low, please ensure that the welding of ultra-thin pipe or plate materials can normally form a molten pool. 3, butt joint plate thickness is less than 3mm, do not open groove; When the plate thickness is 3 ~, open 60~70V groove; When the plate thickness is greater than, open 60~70 X groove. In order to avoid incomplete welding, generally do not leave a blunt edge. 4. The workpiece must be preheated before welding. The preheating temperature is ~ ℃ when the plate thickness is less than 3mm; when the plate thickness is more than 3mm, the preheating temperature is ~ ℃. How to Solder Brass with Electric Iron The brass is welded by hot air gun or flame welding. Buy a roll of solder wire with flux and clean the surface of the workpiece. Since the soldering iron head is installed inside the soldering iron core, it is called an external heating electric soldering iron. The soldering iron core is the key component of the electric soldering iron. It is formed by winding the heating wire in parallel on a hollow porcelain tube, the mica sheet in the middle is insulated, and two wires are drawn to connect with the AC power supply. In iron brass, iron precipitates as particles of iron-rich phase, which serves as a nucleus to refine the grains and prevent the growth of recrystallized grains, thereby improving the mechanical and technological properties of the alloy. The iron content in iron brass is usually below 1.5%, its organization is (α + β), has high strength and toughness, has good plasticity at high temperature, and can be deformed under cold state. Heat the electric soldering iron, and when the solder can be melted just now, apply flux, and then apply solder evenly on the soldering iron head to make the soldering iron head eat a layer of tin evenly. Soldering method, the pads and components of the pin with fine sandpaper polished clean, coated with flux. Use the soldering iron head to dip an appropriate amount of solder and contact the solder joint. After all the solder on the solder joint is melted and the component lead head is immersed, the electric soldering iron head is gently raised away from the solder joint along the pin of the component. The welding time should not be too long, otherwise it is easy to burn the components. If necessary, tweezers can be used to clamp the pins to help dissipate heat. After the welding is completed, the residual flux on the circuit board should be cleaned with alcohol to prevent the flux from affecting the normal operation of the circuit after carbonization. The integrated circuit should be finally soldered, and the electric soldering iron should be reliably grounded, or the waste heat should be used for soldering after power failure. Or use a special socket for integrated circuits, solder the socket and then plug the integrated circuit in.

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