What is the melting temperature of solder?

【Summary Description】 Solder melting What is the melting temperature of solder? Tin melting point. 93 ℃, the most suitable temperature for welding operation is the melting point of the welding in use +50 degrees. The setting temperature of the soldering iron head, due to the size of the soldering part, the power and performance of the electric soldering iron, the type of soldering tin and the difference of the line type, it is advisable to increase the temperature on the basis of the above temperature. with lead solder An alloy consisting of tin (melting point) and lead (melting point). Among them, solder composed of 63% tin and 37% lead is called eutectic solder, and the melting point of this solder is degrees. lead-free solder In order to meet the ROHS standard proposed by the EU environmental protection requirements, the solder is made of tin copper alloy. What are the welding process and operation steps? 1 Five-step welding operation As shown in Figure 3-9, manual soldering iron welding, generally should follow the following five steps (referred to as the five-step operation method): (1) Preparation. Prepare the welding parts, electric iron, solder wire and soldering iron holder and place them in a place convenient for operation. Before welding, the lead wire of the component should be scraped clean, and it is better to tin-plate and then solder. The oxide, oil, rust, dust and impurities on the surface of the welded object shall be cleaned up. (2) Heating the welded parts. Place the soldering iron head at the junction of the two welds and heat the whole weldment for about 1~2s. Pay attention to making the soldering iron head contact the pad and the lead of the component at the same time. (3) into the solder wire. When the soldering surface is heated to a certain temperature, the solder wire contacts the solder from the opposite side of the soldering iron. Note: Do not send the solder wire to the soldering iron head. (4) Remove the solder wire. When the solder melts a certain amount, immediately move the solder wire to the left 45 ° direction. (5) Remove the soldering iron. After the solder infiltrates the solder pad and the welding part, remove the soldering iron 45 degrees upward to the right to finish the welding. From the beginning of step (3) to the end of step (5), the time is about 2~3s. 2 Manual desoldering technology In the production process of electronic products, it is inevitable to disassemble and replace components due to wrong installation, damage or debugging and maintenance needs. This is desoldering, also known as desoldering. In actual operation, desoldering is more difficult than soldering. If desoldering is not possible, it is easy to damage components, break printed wires and fall off pads. Especially when replacing integrated circuits, it is more difficult. Fig. 3-9 Five-step welding operation 1-solder wire; 2-base metal (to be welded);3-electric soldering iron Therefore, folding welding is also an important means of welding process. 1) Principle of desoldering The steps of desoldering are generally opposite to the steps of welding. Before desoldering, the characteristics of the original welding points must be clarified and not easily done. (1) Do not damage the removed components, wires and structural parts of the original welding parts. (2) Do not damage the pads and printed wires on the printed circuit board during desoldering. (3) for the components that have been judged to be damaged, the lead can be cut first, and then removed, which can reduce the possibility of other damage. (4) In the desoldering process, try to avoid disassembling other components or changing the position of other components. If necessary, do a good job of restoration. 2) Several common desoldering methods (1) Split-point welding method. If the two solder joints are far apart, heat them with an electric soldering iron, and then pull them out with tweezers, as shown in Figure 3-10(a). Fig. 3-10 Several common desoldering methods (2) desoldering with a tin absorber. First, the air pressure inside the tin absorber is released and jammed, and then the removed solder joint is heated to melt the solder on the solder pad. Then align the nozzle of the tin absorber with the molten solder, press the small bump on the tin absorber, and the solder will be sucked into the tin absorber, as shown in Figure 3-10 (B). (3) with a suitable medical hollow needle desoldering. The medical hollow needle is filed flat as a desoldering tool. The specific method is: while melting the solder joint with a soldering iron, the needle head is sleeved on the lead wire of the soldered component. After the solder joint is melted, the needle head is quickly inserted into the hole of the printed circuit board to disconnect the pin of the component from the pad of the printed circuit board, as shown in Figure 3-10(c). In addition, the tin-absorbing electric soldering iron is also a special desoldering soldering iron. It combines the electric soldering iron with the tin-absorbing device. While heating the solder joint, the tin is sucked into the inner cavity, thus completing the desoldering more quickly. It is often used to remove multi-pin components.

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