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เนื้อหาย่อ : The History of Machine Soldering 3 eoded away. With the advent of the semiconductor, ultrasonics were w cause damage to the devices on some occasions, and today the chief aitrasonics in soldering in the industry is to be found in the pots used for mponents prior to assembly. This era also saw the introduction of the al in the solder wave. This was one of the ideas that worked extremely ad has been a feature of some solder machines for many years (Fig. 1.2). eal was injected into the wave in several different ways, but the basic idea ame. The oil on the surface of the wave reduced the surface tension of , assisted in the wetting of the parts to be joined, and aided the excess rww drain as the board moved out of the wave. Thus, the use of the oil de incidence of shorts, tended to avoid icicles, and reduced the amount r ased. It also had some effects that were not so advantageous, and the westion of "oil or no oil"-the so called "'dry wave"'-will be discussed Chapter 5. There is no doubt that at that time the use of oil was a eep forward in the development of the machine soldering process. wme years, a wave was considered to be the parabolic shape generated wider is pumped through a plain slot. In more recent times, there have improvements in the basic wave design, but without doubt the rabance has been the introduction of the "*adjustable asymmetrical wave," a adjustable dam to enable the exit portion of the wave to be set to give stationary solder lake. The development of these more sophisticated a save shown that the w wave shape can have a marked effect on the per- e of the soldering machine, and indeed that the modern high density with very tightly packaged components, can be processed much more asing these improved wave shapes. The design of solder waves for