The crucible can be welded by argon arc welding (TIG welding). This process forms an arc between the tungsten electrode and the workpiece, and uses inert gas argon to protect the molten pool to avoid oxidation. It is suitable for precision welding of high melting point metals such as molybdenum.
Specific welding process description
Welding Principle
Argon arc welding uses an arc generated between a non-melting tungsten electrode and the workpiece, melting the base material and filler metal through a high-energy density arc. At the same time, argon gas forms an inert gas protective layer to isolate the air and prevent oxidation and nitridation.
Process characteristics
Controllable heat input: By adjusting the current and welding speed, the heat input can be precisely controlled to avoid overheating and deformation of the molybdenum material.
High weld quality: Under argon protection, the weld is pure with few defects, suitable for molybdenum crucibles with high purity requirements.
Strong applicability: It can weld molybdenum plates with a thickness of 0.5-4mm to meet the needs of crucibles of different specifications.
Key Parameters
Current: 80-400A (adjusted according to the thickness of the molybdenum plate).
Pressure control: Before welding, evacuate to -0.5 to -0.8MPa and fill with argon to a gauge pressure of -0.005 to 0MPa.
Heat treatment: Raise the temperature to about 1500℃ in stages to eliminate welding stress and improve microstructure uniformity.
Process advantages
Avoid oxidation: Argon protection effectively prevents molybdenum from oxidation at high temperatures and maintains the purity of the crucible.
Reduce impurities: No welding slag residue, reduce the introduction of impurities, and ensure the quality of crystal growth.
Strong adaptability: special-shaped structures can be welded to meet the manufacturing needs of crucibles with complex shapes.
Application Effect
The molybdenum crucible prepared by argon arc welding performed well in the crystal growth experiment, with a significantly reduced crucible leakage rate and improved crystal yield. For example, in one case, the crucible leakage rate of the welded molybdenum crucible was 0, and the crystal yield rate reached 49.3%, which is better than the traditional stamping process.
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