在(zai)錫(xi)鉛(qian)(qian)(qian)焊(han)(han)(han)(han)料(liao)(liao)中(zhong)(zhong)，熔(rong)點低于(yu)(yu)450°C稱為軟焊(han)(han)(han)(han)料(liao)(liao)。防氧化(hua)劑焊(han)(han)(han)(han)料(liao)(liao)是(shi)用于(yu)(yu)工業生產中(zhong)(zhong)的自動化(hua)生產線的焊(han)(han)(han)(han)料(liao)(liao)，貼片加(jia)工廠，例如波峰焊(han)(han)(han)(han)。當液態焊(han)(han)(han)(han)料(liao)(liao)暴露在(zai)大氣中(zhong)(zhong)時，焊(han)(han)(han)(han)料(liao)(liao)容易被氧化(hua)，這(zhe)將(jiang)導致虛擬焊(han)(han)(han)(han)接，這(zhe)將(jiang)影響(xiang)焊(han)(han)(han)(han)料(liao)(liao)的質量。因(yin)此，通過向錫(xi) - 鉛(qian)(qian)(qian)焊(han)(han)(han)(han)料(liao)(liao)中(zhong)(zhong)添加(jia)少量活性金屬，可以形成覆蓋層以保護焊(han)(han)(han)(han)料(liao)(liao)免(mian)于(yu)(yu)進一(yi)步氧化(hua)，貼片加(jia)工廠家，從(cong)而(er)提高焊(han)(han)(han)(han)料(liao)(liao)的質量。因(yin)為錫(xi)鉛(qian)(qian)(qian)焊(han)(han)(han)(han)料(liao)(liao)由(you)兩種或多種不同比例的金屬組成。因(yin)此，錫(xi)鉛(qian)(qian)(qian)合金的性能會隨著錫(xi)鉛(qian)(qian)(qian)的比例而(er)變化(hua)。

表(biao)面貼裝(zhuang)SMT加(jia)工(gong)工(gong)藝(yi)分(fen)成三步(bu)：釋放助焊膏----貼裝(zhuang)元(yuan)器件-----流回(hui)焊接(jie)：1、模板(ban)(ban)(ban)(ban)：先依(yi)據所設計方案的(de)(de)(de)PCB生產(chan)加(jia)工(gong)模板(ban)(ban)(ban)(ban)。一(yi)般模板(ban)(ban)(ban)(ban)分(fen)成有機(ji)化學(xue)浸蝕銅模板(ban)(ban)(ban)(ban)或不(bu)銹(xiu)鋼板(ban)(ban)(ban)(ban)模板(ban)(ban)(ban)(ban);光纖激光切割(ge)不(bu)銹(xiu)鋼板(ban)(ban)(ban)(ban)模板(ban)(ban)(ban)(ban)。2、漏印(yin)：其功效是用刮(gua)板(ban)(ban)(ban)(ban)將紅膠漏印(yin)到PCB的(de)(de)(de)焊盤上(shang)，為元(yuan)器件的(de)(de)(de)貼裝(zhuang)做早期提前準備。常(chang)用機(ji)器設備為絲(si)印(yin)機(ji)或手動式絲(si)印(yin)油墨臺，貼片加(jia)工(gong)，刮(gua)板(ban)(ban)(ban)(ban)，貼片加(jia)工(gong)供應(ying)，坐(zuo)落于SMT加(jia)工(gong)工(gong)藝(yi)生產(chan)線(xian)的(de)(de)(de)前端(duan)開發。

在PCBA加工(gong)中，將嚴格要求(qiu)工(gong)作(zuo)人員(yuan)按照儀表或(huo)SMT組(zu)件(jian)的物(wu)料清單(dan)，PCB印刷和外包加工(gong)要求(qiu)進行操作(zuo)，但(dan)電(dian)(dian)子組(zu)件(jian)通常會或(huo)多(duo)或(huo)少地被靜(jing)電(dian)(dian)破壞，會釋放(fang)出靜(jing)電(dian)(dian)在釋放(fang)電(dian)(dian)磁脈沖時，在計(ji)算錯(cuo)誤(wu)時有(you)時還會損(sun)壞設備(bei)(bei)和電(dian)(dian)路。1.所(suo)有(you)接(jie)觸組(zu)件(jian)和產(chan)品(pin)的人員(yuan)均(jun)應穿著防靜(jing)電(dian)(dian)服，防靜(jing)電(dian)(dian)手鐲和防靜(jing)電(dian)(dian)鞋。2.防靜(jing)電(dian)(dian)系統必須具有(you)可靠的接(jie)地裝置。防靜(jing)電(dian)(dian)接(jie)地線不得連接(jie)至(zhi)電(dian)(dian)源的零線，且不得與防雷接(jie)地線共用(yong)。3.所(suo)有(you)組(zu)件(jian)均(jun)視為(wei)靜(jing)電(dian)(dian)敏感設備(bei)(bei)。