Generally, most of the electric heating alloys provided by the manufacturers are basic electric heating elements or raw materials, so further processing is required after the user purchases them before they can be used. The welding of electric heating alloy is one of the very common processing methods, which is helpful for users to install and debug according to their actual usage.
1. Welding performance of electric heating alloys (nickel-chromium, iron-chromium-aluminum):
1. Welding performance of nickel-chromium and nickel-chromium-iron series:
Nickel-chromium and nickel-chromium-iron series have good welding performance, the plastic strength changes after welding are small, there will be no breakage during installation, and no embrittlement will occur after long-term use, and the damaged parts can be repaired.
2. Welding performance of FeCrAl series:
The iron-chromium-aluminum series has poor welding performance, the plasticity decreases after welding, the strength increases, and the embrittlement phenomenon occurs. When installing, pay attention to the phenomenon of breaking, and the alloy cannot be welded and repaired.
How to improve the welding performance of FeCrAl series:
1) Use special electrodes containing rare metal oxides to reduce plasticity decline.
2) Use protective atmosphere welding, such as argon arc welding, to prevent aluminum oxidation.
3) Adopt special connection method for welding.
4) Fast spot welding is used for welding to shorten the high temperature residence time.
5) Quickly cool the joints after welding.
2. Welding method of electric heating alloy (nickel-chromium, iron-chromium-aluminum):
1. Nickel-chromium and nickel-chromium-iron series:
Generally, arc welding is used, and the same alloy electrode is used, and argon tungsten arc welding should be used when the quality is required.
2. Fe-Cr-Al series:
Generally, arc welding is used, but plasma arc welding, electron beam welding, resistance welding and other welding methods suitable for iron-chromium-aluminum alloys can also be used. These welding methods should have the characteristics of gas protection, heat concentration, fast welding speed, and low thermal influence.
