Zr加入新型低Co可伐合金4J46(瓷封合金)及4J44(玻封合金)中,可有效地改善高温晶粒粗大所导致电子管漏气的重大质量问题;但Zr含量高,会发生氩弧焊缝漏气问题而影响使用。本文研究Zr氩弧焊热裂缝成因的作用,以期找出具有良好氩弧焊可焊性的Zr含量上限,确定冶标技术条件中含Zr低Co可伐合金Zr的含量范围。 Zr addition to the new low Co Kovar 4J46 (porcelain seal) and 4J44 (glass seal alloy), which can effectively improve the high temperature coarse grains caused by the large tube leakage of quality problems; but high Zr content, there will be argon arc Weld leaks affect the use of the problem. The purpose of this paper is to study the causes of the hot cracking of Zr-TIG welding in order to find out the upper limit of Zr content with good weldability of argon arc welding and determine the content of Zr with low Co-Kovar content in the standard technical conditions.