The "birdcage" is made of many tungsten rods and needs to be fixed with tungsten rhenium wires. Twist the tungsten-rhenium wire into a twist shape with pliers, and fix the intersecting tungsten bars firmly to avoid shaking. However, the tungsten-rhenium wire used is generally a tungsten-rhenium alloy wire containing 25% rhenium, and the wire diameter is 0.5 mm However, the cost of this tungsten-rhenium wire is relatively high.
At present, pure tungsten wire is also used to bind heating elements, but this kind of tungsten wire has a short life and is easy to break at high temperature.
You can look at the picture below, which is a tungsten wire heater.