真空自耗电弧炉熔炼钛合金铸锭钨夹杂来源分析及对策

Analysis on Sources of Tungsten Inclusion during Melting Titanium Alloy Ingot in Vacuum Consumable Arc Furnace and Its Countermeasures

本文分析了真空自耗电弧炉熔炼钛合金钨夹杂的两种来源,同时提出了消除该两种钨夹杂的对策。一种为在原材料中添加的残料中混入了含钨硬质合金刀具碎块,可通过对残钛屑料增加磁选设备、人工挑选工序的方法,将混入残钛中的异物、尤其是刀具碎块彻底清除干净;另一种为生产过程中焊接设备起引弧作用的钨电极跌落引入,可采取将真空等离子焊箱枪头钨极改为铜极,同时取消炉外手工等离子焊的方法。

This article analyzed the two sources of tungsten inclusion of vacuum consumable arc melted titanium alloy, at the same time. two solutions for eliminating the tungsten inclusion were given in this article. The first source was the fragments of hard metal tool with tungsten mixed in residual titanimn which was added into raw material, by us- ing magnetic separation equipment and manual selection process for residual titanium, the foreign bodies in the residu- al titanium could be thoroughly cleaned up, especially the cutter fragments; the second source was the fallen tungsten electrode which was used for arc striking in welding equipment~ which could be eliminated by replacing the tungsten electrode of the vacuum plasma welding box spearhead with the copper electrode, and removing manual plasma weld- ing outside the vacuum plasma welding box at the same time.