Manual welding welding process
Preparation before welding: pay attention to the cleaning of components and circuit boards. Don't let your hands pollute the PCB pad, and don't let the PCB oxidize. These abnormalities will directly affect the quality.

Welding steps:
1. After fixing the circuit board and components to be welded, you can melt a small amount of solder wire or rosin on the soldering iron head first. This step is convenient for welding, and then the inclined plane of the soldering iron head and the solder wire align with the welding point.
2. When the soldering iron head and the solder wire touch the solder joint at the same time, the solder wire will melt and stick to the component pins very quickly.
3. When the tin on the pin of the component can just cover the solder pad, quickly remove the solder wire. If the solder joint is round and bright, you can also remove the soldering iron head in time. If you feel that the solder joint is not beautiful, you can use the soldering iron head to touch the tin on the solder pad, use the tip of the soldering iron head to pull the liquid tin into a satisfactory shape, and then quickly remove the electric soldering iron.
What we need to know in the welding process is that the more tin is not the better, and less tin is not enough. It is the best if the solder joint just covers the pad and becomes a hemispherical shape. Moreover, the manual welding operation should be accurate, and the electric iron should not be placed on the welding point for a long time, otherwise it will burn the board.

Manual welding depends on manual operation. Electric soldering iron and solder wire are commonly used to complete the welding work.
The main applications of manual welding are narrow, including the following aspects:
1. It is suitable for small batch hand-made miniaturized products, which can be electronic products with strict and high requirements;
2. If the circuit structure is complex and it is not convenient to use machine welding, manual welding can be used;
3. When components need to be replaced during maintenance, and when welding components sensitive to temperature, manual welding is more convenient;
4. Manual welding can be selected if there are bad welding spots that need to be repaired after the machine is welded.

Chengdu ZhongYiDa electromechanical Co., Ltd. was established on October 20, 2015, with its registered address at No. 91044, floor 1, building 9, No. 6, Jinfeng Road, Jinniu District, Chengdu, and its legal representative is fan Lirong. Business scope includes general items: Sales of mechanical equipment; Sales of mechanical and electrical equipment; Fire fighting equipment sales; Sales of metal materials; Wholesale of hardware products; Sales of chemical products (excluding licensed chemical products); Sales of rubber products; Sales of labor protection articles; Sales of pumps and vacuum equipment; Water transportation equipment parts sales; Sales of metal accessories for construction; Sales of building materials; Sales of mechanical parts and components; Optical cable sales; Sales of special labor protection articles; Sales of doors and windows; Mold sales; Sales of building waterproof coiled material products; Sales of building blocks; Distribution switch control equipment sales; Sales of valves and cocks; Wire and cable business; Optical fiber sales; Sales of power facilities and equipment; Sales of anti-corrosion materials; Lubricant sales; Sales of thermal insulation materials; Sales of photovoltaic equipment and components; Sales of fans and fans; Sales of office supplies; Retail of sporting goods and equipment; Wholesale of sporting goods and equipment; Sales of paper products; Stationery retail; Stationery wholesale; Sales of electrical signal equipment and devices; Sales of electronic products; Clothing wholesale; Clothing retail; Sales of daily necessities; Wholesale of auto parts; Sales of automotive decorative supplies; Floor sales; Sales of building ceramic products; Sales of glassware; Metal structure sales; Weighing apparatus sales; Sales of plastic products; Lamp sales; Sales of lighting appliances; Sales of household appliances; Sales of knitwear and textiles; Daily wood products sales; Sales of communication equipment; Sales of instruments and meters; Furniture sales; Sanitary ware sales; Sales of special ceramic products; Sales of daily glass products; Wholesale of shoes and hats; Retail of shoes and hats; Luggage sales; Wholesale of computer software and hardware and auxiliary equipment; Retail of computer software and hardware and auxiliary equipment; Sales of Arts and crafts and etiquette supplies (except ivory and its products); Sales of special equipment for environmental protection; Sales of bearings, gears and transmission parts; Sales of pneumatic and electric tools; Sales of class I medical devices; Sales of hydraulic power machinery and components; Sales of machine tool functional parts and accessories.

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