焊合

[中文适用范围]： 用于任何特定目的的焊料类型和等级的选择将取决于要连接的材料和应用方法。与锡含量较低的材料相比，锡含量较高的材料通常更容易润湿和粘合，并且半熔融范围更窄。出于严格的经济原因@，建议选择含有最少锡量的焊料金属等级，以提供适合应用的流动性和粘合质量。所有含或不含锑的铅锡焊料通常适用于连接钢和铜基合金。对于镀锌钢或锌@，仅应使用 A 级焊料。 B 类焊料@ 含有锑，通常作为某些锡的替代品或增加填充金属的强度和硬度@ 形成金属间锑-锌化合物@，导致接头变脆。不建议使用铅锡焊料来连接铝@镁@或不锈钢。允许的杂质含量如下所示： 在浸焊焊料中，由于浸浴中的吸收，允许最大铜含量为 0.5%。这些 SAE 焊料的成分、温度和类似规格如表 1 所示。 [外文原描述]： The choice of the type and grade of solder for any specific purpose will depend on the materials to be joined and the method of applying. Those with higher amounts of tin usually wet and bond more readily and have a narrower semi-molten range than lower amounts of tin.For strictly economic reasons, it is recommended that the grade of solder metal be selected that contains least amount of tin required to give suitable flowing and adhesive qualities for application.All the lead-tin solders, with or without antimony, are usually suitable for joining steel and copper base alloys. For galvanized steel or zinc, only Class A solders should be used. Class B solders, containing antimony usually as a substitute for some of the tin or to increase strength and hardness of the filler metal, form intermetallic antimony-zinc compounds, causing the joint to become embrittled. Lead-tin solders are not recommended for joining aluminum, magnesium, or stainless steel.Permissible impurity levels are shown:In dipping solders, 0.5% max copper is permissible because of pickup in bath.Compositions, temperatures, and similar specifications of these SAE solders are shown in Table 1 .Cross Reference: ASTM B 32-58T