Generally, tin wire are welded at low temperatures. Due to the low welding temperature, the temperature gradient between the welding thermal shock zone and the welding base metal increases, resulting in an increase in the cooling rate of the thermal shock zone. So, low temperature wet environment will affect the solder wire?
1. Low temperature wet environment affects the reasons for the solder wire
Environment humidity, can make the solder wire (tin) or circuit boards, welding tool due to the improper storage, damp, solder wire welding manually due to high humidity, leading to intermittent welding problems or bad welding, solder wire during the welding process is very common, the solder wire refers to the flux volatile, lead to cooling, contact air condenses on the plate surface, the high temperature of the welding time causes the water to evaporate and spread rapidly, and if the plate surface is not properly angle diffused steam, it will rapidly promote solder formation. In simple terms, the moisture content in the air makes the welding material or tool damp solder when welding at high temperature will produce gas and fried tin.
2. In the face of low temperature and humid environment measures
When we encounter this phenomenon, we should pay special attention to the storage environment and operation environment of flux or welding material, to keep dry, so as to avoid the occurrence of tin frying because of moisture.
3. The influence of external temperature of solder wire
If the external temperature is too low when soldering, the preheating time will be too long. If the preheating time does not reach the temperature of soldering, or the preheating time is too short and the temperature is not enough, the water on the surface of the plate can not be completely evaporated. Once the instant contact with high temperature soldering, there will be fried tin. In addition to the above weather changes caused by tin frying, the operation is not standardized, the surface of the welding material is not clean, the sweat stains on the hands of the operators will also fried tin frying.
Post time: Jul-07-2022