1) When reflow soldering technology is used for soldering, it is not necessary to immerse the printed circuit board in the molten
tin wire, but to complete the soldering task by partial heating; therefore, the components to be soldered are less thermally impacted and will not be affected by Overheating causes damage to components.
2) Since the welding technology only needs to apply tin wire on the welding part, and local heating is completed to complete the welding, thus avoiding welding defects such as bridging.
3) In the reflow soldering process, the tin wire is only used once, and there is no re-use, so the tin wire is very clean and free of impurities, which ensures the quality of the solder joints.
Introduction to the process flow of reflow soldering machine
The reflow soldering process is surface-mounted boards, and its process is more complicated, which can be divided into two types: single-sided mounting and double-sided mounting.
A. Single-sided mounting: pre-coated solder paste → patch (divided into manual mounting and automatic machine mounting) → reflow soldering → inspection and electrical testing.
B, double-sided mounting: pre-coated solder paste on side A → patch (divided into manual mounting and automatic machine placement) → reflow soldering → pre-coated solder paste on side B → patch (divided into manual mounting and automatic machine placement) Mounting) → reflow soldering → inspection and electrical test.
The simple process of reflow soldering is "silk printing solder paste--SMD--reflow soldering, the core of which is the accuracy of silk screen printing. For SMT, the yield rate is determined by the PPM of the machine. Reflow soldering is to control temperature rise and high temperature. and drop temperature curve."
Seven. Maintenance guidelines for reflow soldering machine equipment
We must do maintenance work after reflow soldering; otherwise, it is difficult to maintain the service life of the equipment.
1. Check all parts daily, pay special attention to the conveyor belt, so that it cannot be stuck or dropped
2 When overhauling the machine, shut off the power supply to prevent electric shock or short circuit
3. The machine must be kept stable and must not be tilted or unstable
4. In the case of the suspension of heating in individual temperature zones, first check that the corresponding insurance tube is the paste that is pre-distributed to the printed board pad after re-melting
8. Precautions for reflow soldering machine
1. In order to ensure personal safety, it is necessary for the operator to take off the brand name and ornaments, and the sleeves should not be too loose.
2 Pay attention to high temperature during operation to prevent burns and protect
3. The temperature zone and speed of reflow soldering cannot be set arbitrarily
4. Ensure indoor ventilation, and the exhaust pipe should lead to the outside of the window.
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