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为保证自动钨极氩弧焊焊缝的质量,必须设计合理的喷嘴结构,以提高氩气对焊接熔池的保护效果。我厂使用的ATA-300-1、NZA-2-300、NZA-17-500型自动氩弧焊机的焊枪结构见图1、图2。三种型号的共同缺点是:由于氩气通过氩气管进入枪体后,受到钨极夹头的阻力,造成一侧气流强度大,一侧气流强度小。使氩气自喷嘴流出时,不是以均匀的喇叭口状流向工件,这样,易使空气从气流强度小的一侧侵入熔池。
In order to ensure the quality of the automatic TIG weld, a reasonable nozzle structure must be designed to improve the protective effect of argon on the weld pool. I used the plant ATA-300-1, NZA-2-300, NZA-17-500 automatic welding machine gun structure shown in Figure 1, Figure 2. Common drawbacks of the three models are: the argon gas through the argon tube into the gun body, subject to the resistance of the tungsten chuck, resulting in a large airflow strength, airflow intensity on one side. When flowing argon gas out of the nozzle, the gas does not flow to the workpiece in a uniform bell mouth shape, so that it is easy to intrude the air into the molten pool from the side where the airflow intensity is small.