推荐回答（2个）
可以，具体钎焊要求如下：1.1焊接前的处理措施
先把所需焊接的换热管焊接焊口端表面除去油污、杂物,用细砂布擦去氧化皮,再用酒精、丙酮等有机溶剂清洗,最后用毛巾擦干,立即进行钎焊,以避免焊件在常温下发生氧化。为保证钎焊接头间隙,对钎焊接头的接合面应达到合理的表面粗糙度要求,一般应达到Ra6.3um左右。
1.2合理选择钎焊接头预留间隙
钎焊接头预留间隙的大小与母材和选用的钎料的种类,以及钎焊方法、钎焊温度和钎料的安装方式均有关。组对时不能强行组对,要保留一定的间隙作为钎缝。间隙小,抗拉强度高;间隙的增大,抗拉强度降低。在一定的范围内,减小钎缝间隙可以提高钎缝的致密性,合适的钎焊接头间隙能使接头得到其最高的强度。必须指出钎焊工艺中,钎焊间隙的大小及其控制是十分重要的,所以选择符合标准规格的铜管尤为重要。
1.3钎焊接头的装配和定位方法
钎焊接头装配时,接头形式为插入式,可采用专用的扩口器将换热芯组铜管束两端扩口,按图纸要求将铜管弯件连接至芯组管束内,连接应由内到外分次进行,待内部施焊完毕方可连接外部直至最外部。
1.4钎焊前要进行预热
钎焊前的预热应以待焊管径和壁厚大小为依据来确定,一般预热至暗红色为合适,预热温度一般为450?左右。
钎焊热源采用氧、乙炔气体,中性火焰或轻微的碳化焰,焊接加热时,使钎焊区均匀加热,温度控制在650?-750?之间。在钎焊过程中,先用外焰离外管件12,25毫米处加热外管件,必须用外焰加热钎件,内焰应离钎件18,25毫米,如换热管的管径较小,焊炬火焰可以同时包容内管件和外管件,以尽可能均匀的速度加热两件至钎焊温度。前后和左右摆动焊炬,保持两件于钎焊温度和均匀的加热。这样可以防止热斑的出现及接头过热或加热不足,当紫铜变得橘红时,表明已达到钎焊温度;如变得鲜红,则金属已过热,为了使钎料充满整个接缝间隙,应用氧乙炔焰的外焰沿换热管接头处均匀加热,切不可直接加热钎料。
铜管中间折断，先把两个头切齐(用割管器)，然后用扩管器把其中一个头扩大到另一个头刚好能插入，然后插入另一个头，再用低磷焊条(专门焊铜管用的〉用焊枪烧红铜管，熔入焊条，这样焊接的管子既牢固又外表漂亮。
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