Titanium matrix composite welding and postweld heat treatment method
A titanium-based composite material, post-weld heat treatment technology, applied in heat treatment furnaces, heat treatment equipment, welding/welding/cutting items, etc. The heat treatment process of post-weld joints of composite materials, the low strength of welded joints, etc., achieve the effect of high engineering application value, narrow weld seam, and small heat affected zone
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Embodiment 1
[0034] The 0.5mm thick 2% TiB / Ti-6Al-4V titanium matrix composite plate is processed into a 200×120mm weldment, and the surface of the plate must be pre-treated before welding. The ratio is 1:10, the temperature is 50°C, rinsed with warm water, and dried; then the board is 0.2%HF+8%HNO at room temperature 3 Pickling in +32% HC mixed solution for 12min, then in 25%HNO at 45℃ 3 +2% HF solution for bright treatment, treatment time is 3min, then rinse and dry. Press the processed parts to be welded with welding fixtures, implement butt welding structure, and protect the weld seam with argon gas on the front and back sides of the weldment. / min, the laser power is 1000W, the welding speed is 1.2m / min, and the defocus is -2.5mm to achieve laser welding of titanium-based composite materials. Finally, the weldment is 950℃ / 0.5h+850℃ / 1h+ Vacuum heat treatment is carried out at 400°C / 1h. The tensile test results of the welded joints show that the room temperature tensile strength R of...
Embodiment 2
[0036] The 1.0mm thick 6% (TiB+TiC) / Ti-3Al-2Mo-2Zr titanium-based composite plate is processed into a 200×120mm weldment, and the surface of the plate is pre-treated before welding. Oil agent, its ratio with water is 1:15, the temperature is 50 ℃, wash, dry; Then the plate is 0.5%HF+6%HNO at room temperature 3 Pickling in +35% HCl mixed solution for 10min, then in 35%HNO at 50℃ 3 +2% HF solution for bright treatment, treatment time is 5min, then rinse and dry. Press the processed parts to be welded with welding fixtures, implement butt welding structure, and protect the weld seam with argon gas on the front and back of the weldment. The gas flow rate is 15L / min, and the gas flow rate of the tail trailing hood is 10L / min. The laser power is 1400W, the welding speed is 2.4m / min, and the defocus is -1.5mm to achieve laser welding of titanium-based composite materials. h conditions for vacuum heat treatment. The tensile test results of the welded joints show that the room tempe...
Embodiment 3
[0038] 1.5mm thick 4% (TiB+Y 2 o 3 ) / Ti-6.5Al-2Zr-1Mo-1V titanium-based composite plate is processed into a 200×120mm weldment, and the plate must be pre-treated before welding. The ratio is 1:20, the temperature is 50°C, rinsed and dried; then the plate is 1.0%HF+10%HNO at room temperature 3 Pickling in +45% HCl mixed solution for 15min, then in 45%HNO at 65℃ 3 +4% HF solution for bright treatment, treatment time is 8min, then rinse and dry. Press the processed parts to be welded with welding fixtures, implement the butt welding structure, and protect the weld seam with argon gas on the front and back of the weldment. min, the laser power is 2000V, the welding speed is 3.0cm / min, the defocus is -1.0mm, and the laser welding of titanium matrix composites is realized. Vacuum heat treatment is carried out under the condition of 450℃ / 2.5h. The tensile test results show that the room temperature tensile strength R of the welded joint m =1140.5MPa, reaching 93.8% of the stren...
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