目前,各小化肥厂用的易腐蚀氨水管,很多已由钢管改为铝管。但对氧-乙炔气焊铝管往往感到困难。根据几年的实践,现将采用中长碳化焰气焊铝管的方法介绍如下: 在铝的氧-乙炔气焊中,采用中长碳化焰是比较合适的。所谓中长碳化焰,就是焰芯为20毫米左右的碳化焰。焊接与加温时,焊嘴与工件保持一定距离,以10～20毫米为宜。这样可使焊缝区始终笼罩在碳 At present, many small-scale fertilizer plants with easy to corrosion ammonia pipe, many have been changed from steel to aluminum pipe. But oxygen - acetylene gas welded aluminum tube often feel difficult. According to several years of practice, the method of using long carbonized flame gas welded aluminum pipe will now be introduced as follows: In aluminum oxy-acetylene gas welding, the use of long carbonized flame is more appropriate. The so-called long carbide flame, flame core is about 20 mm carbide flame. Welding and heating, the tip and the workpiece to maintain a certain distance to 10 to 20 mm is appropriate. This will allow the weld area is always shrouded in carbon