Welding is a process for joining similar metals. Welding joins metals by melting and fusing firstly, the base metals being joined and secondly, the filler metal applied. Welding employs pinpointed, localized heat input. Most welding involves ferrous-based metals such as steel and stainless steel. Welding covers a temperature range of 1500º F - 3000º F (800ºC - 1635ºC). Weld joints are usually stronger or as strong as the base metals being joined.或者是：The process of joining together two pieces of metal so that bonding accompanied by appreciable interatomic penetration takes place at their original boundary surfaces. The boundaries more or less disappear at the weld, and integrating crystals develop across them. Welding is carried out by the use of heat or pressure or both and with or without added metal. There are many types of welding including Metal Arc, Atomic Hydrogen, Submerged Arc, Resistance Butt, Flash, Spot, Stitch, Stud and Projection.
Resistance spot welding is welding technique that is used for almost all known metals. 接触点焊是适用于几乎所有金属的技术。The actual weld is made at the interface of the parts to be joined. 实际在不同部分的接触面进行焊接。The electrical resistance of the material to be welded causes a localized heating at the interfaces of the metals to be joined.被焊接材料的电阻引起材料的接触面产生局部发热。Welding procedures for each type of material must be developed for the most satisfactory results.各种材料的焊接工艺必须描述到基本令人满意的程度。It is possible that shunt currents flowing through a previously made spot weld will take welding current away from the second second spot weld to be made. 有可能通过前一个完成焊点的分路电流将使电流远离将要操作的第二个焊点。This will occur if the two spot welds are too close together, and it will happen with all metals. 对于所有的金属来说，如果两个焊点在一起距离非常近这钟情况将发生。The following tables and charts are intended as guides for setting up resistance spot welding procedures. 下面的表格和图形是接触点焊的工艺的说明。The exact time, pressure, and current setting will depend on the specific application and the KVA rating of the resistance spot welding machine employed. 详尽的运用说明和接触点焊机的千伏安级别说明了准确时间，电压，电流设置。Some areas of the tables may not apply to resistance spot welders in the KVA ratings available from this company.在这家公司提供的千伏安级别表格的一些部分可能不适用于接触点焊机。
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