A method of rotary friction welding of dissimilar metals

A technology of rotational friction welding and dissimilar metals, applied in metal processing equipment, welding equipment, non-electric welding equipment, etc., can solve the problems of high equipment requirements, low joint welding quality, huge difference in metal melting point and high temperature mechanical properties, etc., to achieve The pressure value is reduced, the plastic deformation is reduced, and the welding quality is improved.

Active Publication Date: 2019-01-11
DALIAN UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0010] According to the technical problems raised above, a sheath structure and a rotary friction welding method for rotary friction welding of dissimilar metals are provided to solve the problem of direct friction welding of titanium steel in the existing rotary friction welding of dissimilar metals. There is a huge difference in the melting point of the side metal and the high-temperature mechanical properties, and the resulting joint area is only severely plastically deformed on the titanium side, forming a large number of flashes, while the base metal on the steel side is basically not deformed, so that the oxide inclusions on the steel surface cannot be completely removed. , resulting in the lack of high welding quality of the joints and the shortcomings of high equipment requirements

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  • A method of rotary friction welding of dissimilar metals
  • A method of rotary friction welding of dissimilar metals
  • A method of rotary friction welding of dissimilar metals

Examples

Experimental program
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Effect test

Embodiment 1

[0044] Embodiment 1, a kind of TA2 pure titanium and 45# steel rotational friction welding method, its specific process comprises the following steps:

[0045] Step 1, prepare the 45# steel ladle structure, and the threaded structure on one side of the TA2 titanium rod to be welded; select the 45# steel bar with a diameter greater than 2mm of the steel rod to be welded, and process it into a length of 10mm, with an internal thread size of A sheath structure with a height of 0.5mm, a pitch of 1mm, an inner diameter equal to the diameter of the bar to be welded, and a depth of 9mm.

[0046] And each surface to be welded is machined to a roughness Ra≤3.2μm, and then the oil and impurities are removed by acetone ultrasonic cleaning to obtain a sheath structure; one end of the titanium alloy to be welded is processed into a threaded structure that is tightly matched with the sheath structure, and the thread The overall length is 9.5mm.

[0047] Step 2, assemble the structural join...

Embodiment 2

[0050] Embodiment 2, a kind of rotational friction welding method of TC4 titanium alloy and 1Cr18Ni9Ti stainless steel, its concrete process comprises the following steps:

[0051] Step 1, prepare the 1Cr18Ni9Ti stainless steel sheath structure, and the threaded structure on one side of the TC4 titanium alloy rod to be welded; select the 1Cr18Ni9Ti stainless steel rod with a diameter greater than 4mm of the steel rod to be welded, and process it into a length of 12mm, with an internal thread size of 1mm high, 1mm pitch, inner diameter equal to the diameter of the bar to be welded, and a sheath structure with a depth of 10mm.

[0052] And each surface to be welded is machined to a roughness Ra≤3.2μm, and then the oil and impurities are removed by acetone ultrasonic cleaning to obtain a sheath structure; one end of the TC4 titanium alloy to be welded is processed into a threaded structure that is tightly matched with the sheath structure, The total thread length is 10.5mm.

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Embodiment 3

[0056] Embodiment 3: a kind of rotational friction welding method of TC4 titanium alloy and 0Cr17Ni12Mo2 stainless steel, its concrete process comprises the following steps:

[0057] Step 1, prepare the 0Cr17Ni12Mo2 stainless steel sheath structure, and the threaded structure on one side of the TC4 titanium alloy rod to be welded; select the 1Cr18Ni9Ti stainless steel rod with a diameter greater than 3 mm of the steel rod to be welded, and process it into a length of 10 mm, with an internal thread size of A sheath structure with a height of 0.8mm, a pitch of 1mm, an inner diameter equal to the diameter of the bar to be welded, and a depth of 8.5mm.

[0058] And each surface to be welded is machined to a roughness Ra≤3.2μm, and then the oil and impurities are removed by acetone ultrasonic cleaning to obtain a sheath structure; one end of the TC4 titanium alloy to be welded is processed into a threaded structure that is tightly matched with the sheath structure, The total thread...

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Abstract

The invention discloses a sheath structure used for spin friction welding of a dissimilar metal and a spin rotation welding method. The sheath structure is of a cylindrical sleeve machined by a cylindrical steel material, and internal threads are machined on the inner wall of the cylindrical sleeve; during spin rotation welding, external threads on the end part of a dissimilar metal bar material are in threaded connection with the internal threads of the sheath structure, and the end surface of a steel bar material and the steel end surface of the sheath structure are in contact spin friction. According to the sheath structure used for spin friction welding of a dissimilar metal and a spin rotation welding method, nonuniform plastic deformation caused by a huge difference of high temperature performance of the dissimilar metal is greatly reduced, such that the residual stress of a weld zone is reduced, oxide inclusion on the steel surface is thoroughly cleaned, the sheath structure also plays a role of restraining the metal of a mold, and further the welding quality is improved. Meanwhile, requirements on the device capacity are also greatly reduced in a welding process.

Description

technical field [0001] The invention relates to a cladding structure for friction welding of dissimilar metals and a rotational friction welding method of titanium or titanium alloy and steel using the cladding structure. Background technique [0002] At present, titanium or titanium alloys have high specific strength, excellent corrosion resistance and good processability, and are widely used in aerospace, medical, metallurgy and other fields, and are known as the third rising contemporary metal. However, the primary problem limiting the application and promotion of titanium alloys is the high price. Steel, including carbon steel, alloy steel, and stainless steel, is relatively cheap and is one of the most widely used structural materials in the industrial field. Bimetallic composite components of titanium or titanium alloy and steel can give full play to their complementary advantages in performance and economy, and have broad application prospects in the fields of aerosp...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K20/12B23K20/26B23K20/227
CPCB23K20/122B23K20/227B23K20/26
Inventor 李鹏董红刚
Owner DALIAN UNIV OF TECH
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