Brief introduction of selective wave soldering defects and prevention
Brief introduction of selective wave soldering defects and prevention
Selective wave soldering defects and their prevention. The main problem that currently affects the soldering process lies in the trend of lead-free soldering conversion and miniaturization. Micro soldering refers to more SMD components on a printed circuit board. Soldering techniques for processing solder joints include more reflow applications. The assembled through-hole components should be automatically soldered to ensure the best quality. The connection method of the component and the electronic board depends on the number of solder joints, but for most products, selective soldering is the best way to replace pallet wave soldering or manual soldering. Welding technology is now quite sophisticated, but it still has typical defects. The lead-free solder that can only be provided locally has a high melting point and requires a higher operating temperature, which increases the risk of certain specific defects, including the following: · solder joint peeling· tailing· tin bridge· tin ball· copper The high temperature of pad dissolving poses no small challenge to the flux. Too little flux may cause welding defects such as false soldering, and too much flux will cause electron migration due to residual flux. This paper will discuss these typical defects and introduce how to optimize process parameters to prevent defects.
Hydraulic universal testing machines have very high accuracy requirements.
The hydraulic system is the power drive mechanism of the tensile testing machine.
The specific application of the electronic universal testing machine in the automobile manufacturing process: The electronic universal testing machine needs to be used for automobile parts.
Wave soldering refers to the molten solder (lead-tin alloy), sprayed by electric pump or electromagnetic pump into the solder wave required by the design, can also be formed by injecting nitrogen into the solder pool, so that it is pre-loaded The printed board of the component realizes the soft soldering of the mechanical and electrical connection between the solder end or the pin of the component and the pad of the printed board through the solder wave.
The frequency converter is a power control equipment that uses frequency conversion technology and microelectronics technology to control AC motors by changing the frequency of the motor's working power supply.
Electronic universal testing machine is a necessary equipment to control the quality of products.
The calibration operation of the electronic universal testing machine is still relatively unfamiliar to friends who use it for the first time.
Testing machine, broadly speaking, is an instrument that verifies the quality or performance of a product or material according to the design requirements before it is put into use.
The tensile force is not an accurate value after being measured by the testing machine, and subsequent calculations are required to get the desired value.
In order to prevent accidents, safety protection devices are installed in the design of the testing machine.
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