Brief description of the welding process is generally divided into several stages?

【Summary Description】 Welding process Brief description of the welding process is generally divided into several stages? The welding process can be generally divided into three stages: preparation before welding, welding and inspection after welding. What are the basic methods and steps of manual welding? Welding methods and steps: 1. Preparation for welding: Before welding, check the electric soldering iron. The soldering iron head should be kept clean and in a tin state, which is ready for welding. Generally, the solder wire is held in the left hand and the electric soldering iron in the right hand. The soldering iron head and the solder wire are close to each other and can be welded at any time. At the same time, the position is identified. 2. Heating weldment: contact the soldering iron head with the solder joint of the component to be soldered, and heat the soldering iron head with tin on the solder joint with the lead wire of the component to be soldered along the direction of 45 angle to heat the solder joint. 3. Melting solder: After the component lead is heated to a temperature that can melt solder, touch the solder wire from the opposite side of the soldering iron head to the surface of the soldering place in time along the 45 direction, and the contact solder piece melts an appropriate amount of solder. 4, the withdrawal of solder wire: melt the right amount of solder wire quickly after the solder wire removed. 5. Withdraw the electric soldering iron: the solder on the soldering point is close to full, the solder wire fully infiltrates the solder pad and the soldering part, and the solder leaves in the direction of the most 45 angle, so that a bright and smooth solder joint can be formed, and the time taken to complete the whole process of soldering a solder joint is about 3-5s, which is the best, and the time cannot be too long. Manual welding precautions 1, the selection of appropriate solder, should choose the low melting point solder wire for welding electronic components. 2, flux, with 25% rosin dissolved in 75% alcohol (weight ratio) as a flux. 3. Tin should be applied to the electric soldering iron before use. The specific method is: heat the electric soldering iron, and when the soldering tin 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. 4. Welding method: polish the pads and pins of the components with fine sandpaper and coat them 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. 5. 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. 6. The solder joint shall be in the shape of a sinusoidal wave crest, the surface shall be bright and smooth, and the tin quantity shall be moderate. 7. After the welding is completed, the residual flux on the circuit board should be cleaned with alcohol to prevent the flux after carbonization from affecting the normal operation of the circuit. 8. The integrated circuit should be finally welded, and the electric soldering iron should be reliably grounded, or the waste heat should be used for welding after power failure. Or use a special socket for integrated circuits, solder the socket and then plug the integrated circuit in. 9. The electric soldering iron should be placed on the soldering iron rack.

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