We all know that the use of lead-free soldering materials will have a serious impact on the soldering process. Therefore, in the lead-free soldering process, the selection of soldering materials is the most challenging. Because for lead-free soldering process, the selection of
lead-free tin wire, solder paste, flux and other materials is the most critical and most difficult. The type of solder components, the type of circuit board, and their surface finish should also be considered when selecting these materials. Therefore, in developing a lead-free soldering process, all relevant aspects of the soldering process must be optimized.
A few steps on the development of lead-free solder wire soldering process help lead-free soldering process development and process optimization.
1. Determine the process route and process conditions
After the first step is completed, the welding process test can be carried out on the selected welding material. Determine the process route and process conditions through experiments. During testing, sufficient testing of the listed welding materials is required to understand their properties and effect on the process. The purpose of this step is to develop samples for lead-free soldering.
2. Control and improve the process
The lead-free soldering process is a dynamic arena. Factories must be alert to various problems that may occur to avoid process out of control, and also need to continuously improve the process to continuously improve the quality and qualified crystal rate of the product. As with any lead-free soldering process, improved soldering materials, as well as updated equipment, can improve the solderability of the product.
3. Develop and improve welding process
This step is a continuation of the second step. It is the analysis of the experimental data collected in the process test in the second step to improve materials, equipment or change the process in order to obtain a sound process under laboratory conditions. In this step, it is also necessary to understand the possible contamination of the lead-free alloy soldering process, know how to prevent it, determine the process capability (CPK) value of various soldering characteristics, and compare with the original tin/lead process. Through these studies, inspection and testing procedures for the welding process can be developed, and some methods of processing out-of-control processes can also be identified.
Also, note that the overall process of lead-free soldering is longer than that of lead-containing solder, and the required soldering temperature is higher, due to the higher melting point of lead-free solder than that of lead-containing solder, and its wetting Sex is a little worse. After the welding method is selected, the type of welding process is determined. At this time, it is necessary to select equipment and related process control and process inspection instruments according to the welding process requirements, or to upgrade. The selection of welding equipment and related instruments is as critical as the selection of welding materials.
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