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Attention of lead-free reflow soldering temperature

Time:2014-06-26Source:This siteViews:1228

A lead-free reflow belongs to the reflow soldering. Solder early reflow are leaded materials. Along with the environmental protection thought deeply, people pay more and more attention to lead-free technology (i.e. the lead-free reflow now welding). In materials, especially the change of solder on the maximum. And in the process, the greatest impact is the welding process. Characteristics of this mainly from the solder alloy and the corresponding flux caused by.

Lead-free flux after pollution due to influence of high temperature oxidation and is particularly obvious, lead-free reflow soldering equipment are equipped with a flux management system, prevent and high temperature air mass flux into the cooling and condensation in the heat sink and stove body, reduce the cooling effect and pollution equipment.

Lead-free reflow soldering system is the high temperature gas contains a lot of flux from the preheating zone, and then flow zone and cooling zone before taking, after in vitro cooling filter system, the clean gas is sent back into the inside, it also has a good note is to use nitrogen protection lead-free reflow curve set.

1, increasing the preheating temperature
Lead free reflow soldering, reflow furnace preheating zone temperature should be higher than the preheating temperature of the tin / lead alloy will flow. Usually high 30 ℃, at 170 ℃ -190 ℃ (traditional general preheating temperature at 140 ℃ -160 ℃) increasing the preheating temperature is designed to reduce the peak temperature in order to reduce the temperature difference between the components.

2, extend the preheating time
Appropriate to extend the preheating time preheating, a preheating too fast will lead to thermal shock, is not conducive to reducing the temperature in the ion of the peak reflow sweater, the temperature difference between the components. Therefore, appropriate to extend the preheating time preheating, the welded components temperature rises to a predetermined smooth preheating temperature.

3, extend the reflow zone ladder temperature curve
Prolong the flow zone ladder temperature curve. The highest temperature in the control flow again at the same time, increased reflow temperature curve width, peak time prolonging the small heat capacity components, reflux temperature so that the size of heat capacity of the components are required, and avoid overheating small components.
Consistency of 4, adjusting the temperature curve

Adjustment and test temperature curve, while the temperature curve of each test point have certain discrete, may not be completely consistent, but be careful adjustment, make the test temperature curve to tend to the same.
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