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PCBA貼片在焊接之前的哪些因素會(huì)有影響?

Release Time:2021-11-10 Edit the author:金致卓 Reading:6764

PCBA貼片的生產(chǎn)進(jìn)行加工中在回流焊階段可以采用不同溫度變化曲線的預(yù)熱對(duì)于焊接工作質(zhì)量的提升是有顯著影響效果的。下面給大家一個(gè)簡(jiǎn)單介紹一下回流焊前的預(yù)熱都有什么效果。

再流焊溫度曲線的設(shè)置直接影響到PCBA貼片的質(zhì)量?;亓骱盖熬徛訜岷皖A(yù)熱有助于活化助焊劑,防止熱震,提高焊點(diǎn)質(zhì)量。

回流焊的預(yù)熱階段起著將整個(gè)PCBA組件的溫度從室溫穩(wěn)定升高到低于焊膏熔點(diǎn)(通常接近150攝氏度)的保持溫度,并調(diào)節(jié)溫度變化以保持每秒幾度的恒定斜率的作用。SMT加工的回流預(yù)熱階段完成后,就是均熱階段,會(huì)保持一段時(shí)間的溫度,保證板材受熱均勻。然后回流階段開始形成焊點(diǎn)。在預(yù)熱和浸泡階段,焊膏中的揮發(fā)性溶劑被燒掉,焊劑被激活。

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