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电子产品和家用电器的制造和维修,要用大量焊锡;日常生活中,修补铜铁制品,也少不了焊锡。这些焊锡中的大部分,属于锡基低熔点合金;所有用电场合都离不开的保险丝,以及印刷报章杂志和打字机上使用的铅字,属于铅基低熔点合金;高压锅上的易熔塞或易熔片,属于铋基低熔点合金;在铋基低熔点合金中,加入0.5～5％的铟,熔点仅为49℃,是牙
Electronic products and home appliances manufacturing and maintenance, use a lot of solder; daily life, repair copper and iron products, but also ultimately, solder. Most of these solders are tin-based low-melting-point alloys; all fuses that can not be separated from electrical applications; and type characters used in printed newspapers, magazines and typewriters are lead-based low-melting alloys; fusible plugs on pressure cooker or Fusible, belongs to bismuth-based low melting point alloy; in the bismuth-based low-melting point alloy, adding 0.5 to 5% indium, the melting point is only 49 ℃, is the tooth