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我车间钢圈对焊机(HZH—120型)焊接的零件焊缝中间有一条黑线(如图1),焊缝强度不高。主要原因是闪光时凸轮送进速度不能满足烧化速度。烧化过程是这样的:凸轮把右侧导架移动,被焊端面轻微接触,当强大电流通过端部最凸出的触点时,产生的热量除一部分传入钢圈外,其余部分使触点金属迅速熔化爆炸,将金属粒子从两端面缝隙射出,焊机机架继续前进,新的触点将连续不断地接触爆炸。这就是烧化过程。烧化分为两个阶段。前段温度低,烧化电流密度较大,这时烧化速度为V_1,随着加热过程加剧,温度不断提高,电阻增大,为了提高电流密度,要求较高的速度送进,以保证连续烧化。后阶段烧化速度为
I workshop steel ring on the welder (HZH-120 type) welded parts of the middle of the weld with a black line (Figure 1), the weld strength is not high. The main reason is that the flash feed speed can not meet the burn rate. The burnishing process is as follows: the cam moves the right guide frame and is slightly touched by the welding end surface. When the strong current passes through the most protruding contact of the end portion, the generated heat is transmitted to the steel ring except for a part, and the rest makes the contact Metal quickly melted and exploded, the metal particles from the two ends of the gap injection, the welding machine frame to move forward, the new contact will continue to contact the explosion. This is the burning process. Burning is divided into two stages. The temperature of the front section is low and the current density of the burn-in current is large. At this time, the burning speed is V_1. As the heating process is intensified, the temperature is continuously increased and the resistance increases. In order to increase the current density, a higher speed is required to ensure continuous burning. After the stage of firing rate