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壓ya塗tu在zai焊han芯xin表biao麵mian的de塗tu層ceng稱cheng為wei藥yao皮pi。焊han條tiao的de藥yao皮pi在zai焊han接jie過guo程cheng中zhong起qi著zhe極ji為wei重zhong要yao的de作zuo用yong。若ruo采cai用yong無wu藥yao皮pi的de光guang焊han條tiao焊han接jie，則ze在zai焊han接jie過guo程cheng中zhong，空kong氣qi中zhong的de氧yang和he氮dan會hui很hen多duo侵qin入ru熔rong化hua金jin屬shu，將jiang金jin屬shu鐵tie和he有you益yi元yuan素su碳tan、矽、mengdengyanghuahedanhuagouchenggezhongyanghuawuhedanhuawu，bingcanliuzaihanfengzhong，xingchenghanfengjiazhahuoliewen。errongrurongchizhongdeqitikenengshihanfengfashenghenduoqikong，zhexieyinsudounengshihanfengdejixiexingneng（強度、衝擊值等）大大降低，一起使焊縫變脆。此外采用光焊條焊接，電弧很不安穩，飛濺嚴重，焊縫成形很差。
人(ren)們(men)在(zai)實(shi)踐(jian)過(guo)程(cheng)中(zhong)發(fa)現(xian)如(ru)果(guo)在(zai)光(guang)焊(han)條(tiao)外(wai)麵(mian)塗(tu)一(yi)層(ceng)由(you)各(ge)種(zhong)礦(kuang)藏(zang)等(deng)組(zu)成(cheng)的(de)藥(yao)皮(pi)，能(neng)使(shi)電(dian)弧(hu)燃(ran)燒(shao)安(an)穩(wen)，焊(han)縫(feng)質(zhi)量(liang)得(de)到(dao)進(jin)步(bu)，這(zhe)種(zhong)焊(han)條(tiao)叫(jiao)藥(yao)皮(pi)焊(han)條(tiao)。跟(gen)著(zhe)工(gong)業(ye)技(ji)術(shu)的(de)不(bu)斷(duan)發(fa)展(zhan)，人(ren)們(men)創(chuang)製(zhi)出(chu)了(le)廣(guang)泛(fan)應(ying)用(yong)的(de)優(you)質(zhi)厚(hou)藥(yao)皮(pi)焊(han)條(tiao)。
