农机修理中离不开电气焊。为防止焊修时零件扭曲变形,可采用以下方法。 (1)预热法就是焊前把要施焊的零件加热。这样可以减小内应力,是防止变形的好办法。 (2)加楔法用楔子夹在长焊缝施焊的另一端以防变形。 (3)水冷法利用冷却水喷射焊件或将焊件大部分浸在水槽中,仅使施焊部分露出水面。这样,由于焊件基体金属温度不会太高,可防 Agricultural machinery repair can not do without electrical welding. In order to prevent distortion of the parts when welding repair, the following methods can be used. (1) Preheating method is to heat the parts to be welded before welding. This can reduce the internal stress, is a good way to prevent deformation. (2) plus wedge method with wedges in the long weld welding the other end to prevent deformation. (3) Water-cooling method Spraying the weldment with cooling water or immersing the weldment in the sink for the most part, exposing only the welded part to the surface of the water. In this way, because the weld metal base metal temperature will not be too high, can prevent