Method for preparing sandwich type composite brazing filler metal for hard alloy brazing
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A technology of cemented carbide and composite solder, which is applied in welding equipment, metal processing equipment, welding/cutting media/materials, etc., can solve the problems of large residual stress in joints, high production costs, and low weld strength, and achieve production The effect of high efficiency, improved performance, and improved weld strength
Active Publication Date: 2014-09-17
哈尔滨瀚霖科技开发有限公司
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[0004] The purpose of the present invention is to solve the problems of large joint residual stress, easy cracking, low weld strength and high production cost in the brazing of hard alloy and hard alloy by using the existing solder, and provide hard alloy brazing Preparation Method of Sandwich Sandwich Type Composite Solder
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specific Embodiment approach 1
[0024] Specific embodiment one: the preparation method of the sandwich sandwich type composite filler material for cemented carbide brazing in this embodiment is realized according to the following steps:
[0025] 1. Surface pretreatment: Use water sandpaper and metallographic sandpaper to grind the surface of tungsten sheet, cobalt sheet and copper sheet step by step in order from coarse to fine to remove oxide film, then wash with alkali for 5-10 minutes, and rinse with water , then pickled for 5-10 minutes, rinsed with water, then ultrasonically cleaned in acetone for 10-30 minutes, and dried with hot air for later use;
[0026] 2. Cleaning of active solder: take an active solder foil with a thickness of 0.1-0.5 mm to polish the surface to remove the oxide film, then place it in acetone for ultrasonic cleaning for 10-30 minutes, clean it with deionized water, and dry it for later use;
[0027] 3. Card loading: the tungsten sheet, cobalt sheet, copper sheet and active solder...
specific Embodiment approach 2
[0032] Embodiment 2: The difference between this embodiment and Embodiment 1 is that in step 1, wash with alkali for 8 minutes, rinse with water, then pickle for 8 minutes, rinse with water, and then ultrasonically clean in acetone for 20 minutes. Other steps and parameters are the same as those in Embodiment 1.
specific Embodiment approach 3
[0033] Specific embodiment three: the difference between this embodiment and specific embodiment one or two is that in step one, the NaOH solution with a mass concentration of 5% to 30% at room temperature is used for alkali washing; the mass concentration of 5% to 50% is used for pickling HNO 3 solution. Other steps and parameters are the same as those in Embodiment 1 or Embodiment 2.
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Abstract
The invention relates to a method for preparing composite brazing filler metal, in particular to a method for preparing sandwich type composite brazing filler metal for hard alloy brazing. The method for preparing the sandwich type composite brazing filler metal for hard alloy brazing mainly solves the problems that when used for brazing of one kind of hard alloy and another kind of hard alloy, existing brazing filler metal has the disadvantages that residual stress of a joint is high, cracking occurs easily, the strength of a brazing seam is low in the working process and production cost is high. The method comprises the steps of (1) surface pretreatment, (2) active brazing filler metal cleaning, (3) fixation, (4) cold rolling machining and annealing treatment and (5) activating reaction treatment. The sandwich type composite brazing filler metal is simple in preparing process, high in production efficiency, and suitable for connecting processes such as vacuum brazing, brazing in controlled atmosphere and diffusion brazing of one kind of hard alloy and another kind of hard alloy; residual stress of the joint between one kind of hard alloy and another kind of hard alloy is remarkably reduced, the strength of the brazing seam is improved, and the performance of the overall hard alloy component is improved; the sandwich type composite brazing filler metal is adaptive to brazing of a large amount of hard alloy with various specifications in a furnace, largely improves production efficiency of hard alloy brazing and reduces production cost.
Description
technical field [0001] The invention relates to a preparation method of composite solder. Background technique [0002] Cemented carbide is an alloy material made of extremely hard refractory metal carbides such as WC and bonding metals such as Co through powder metallurgy. Cemented carbide has a series of excellent properties such as high hardness, wear resistance, good strength and toughness, heat resistance and corrosion resistance, especially its high hardness and wear resistance, which basically remain unchanged even at a temperature of 500°C , still has a high hardness at 1000 ° C, and has become the main material of cutting tools. However, the price of cemented carbide is relatively high, and its bending strength and impact toughness are poor. In order to save costs, the size of cemented carbide is relatively small when sintered. However, as the size of the workpiece increases, the size of the corresponding carbide tool also increases. At this time, welding technol...
Claims
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