Method for friction-deformation-diffusion welding of circular-groove-assisted reinforcing tube plate
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A technology of diffusion welding and annular groove, applied in welding equipment, non-electric welding equipment, metal processing equipment, etc., can solve problems such as complex production process, high-temperature joint relaxation, gap corrosion, etc., to reduce production costs, avoid cracks, and improve sealing sexual effect
Active Publication Date: 2016-03-23
HARBIN INST OF TECH
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[0003] In order to solve the problems of high-temperature joint relaxation, crevice corrosion, low strength, complex production process and high cost when connecting heat exchanger tubes and tube sheets, the invention provides a method of using annular grooves to assist in strengthening the friction of the tube-plate structure. Deformation Diffusion Welding Method
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specific Embodiment approach 1
[0027] Specific implementation mode one: combine Figure 1 to Figure 8 Describe this implementation mode, this implementation mode is realized through the following steps:
[0028] Step 1. Annular grooves 2-1 are formed on the inner wall of the tube sheet 2: before welding, 1 to 3 annular grooves 2-1 are formed at a distance s from the upper surface of the tube sheet 2 to assist in strengthening the connection strength of the tube-plate structure, see figure 1 and figure 2 ;
[0029] Step 2, pre-welding treatment: first remove the oxide film on the inner and outer walls of the tube 1, the upper surface of the tube sheet 2, and the surface of the annular groove 2-1 by mechanical grinding, and then use an organic solvent or cleaning agent to wipe the surface of the tube 1 and the tube sheet 2, Remove oil and metal dust;
[0030] Step 3, clamping of tube 1 and tube plate 2: when clamping, the gap between the outer wall of tube 1 and the inner hole of tube plate 2 is e, and t...
specific Embodiment approach 2
[0033] Specific implementation mode two: combination figure 1 and figure 2 To describe this embodiment, in this embodiment, in step 1, the width g of the annular groove 2 - 1 is 2 mm to 5 mm, and the depth h is 0.1 mm to 0.5 mm. Other steps are the same as in the first embodiment.
specific Embodiment approach 3
[0034] Specific implementation mode three: combination figure 1 Describe this embodiment. In this embodiment, in step 1, the distance from the annular groove 2-1 to the upper surface s of the tube plate is 3 mm to 10 mm, and the groove distance j between two adjacent annular grooves 2-1 is 2 mm to 8 mm. Other steps are the same as those in Embodiment 1 or 2.
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Abstract
The invention discloses a method for friction-deformation-diffusion welding of a circular-groove-assisted reinforcing tube plate, and aims to solve the problems that a high-temperature joint loosens, crevice corrosion occurs, the production process is complex and the cost is high when a tube and a tube plate of a heat exchanger are connected according to an expanded jointing method, a fusion welding method as well as a method integrating the expanded jointing method and the fusion welding method. The method provided by the invention comprises the following steps: (1) one or more circular grooves are formed in the inner wall of the tube plate; (2) the surfaces of the tube and the tube plate are scrubbed by adopting an organic solvent or a cleaning agent; (3) the tube and the tube plate are clamped in a clearance fit manner; (4) friction welding is performed, wherein the diameter of the large end of a friction needle is larger than the inner diameter a of the tube and smaller than the outer diameter b of the tube, so that the circular grooves can be fully filled with a thermoplastic tube material gradually to form mechanical meshing under the squeezing action of the friction needle; (5) when a shaft shoulder of a friction head is pressed in the upper surface of the tube plate at a depth of t, the friction head keeps rotating at a high speed and remains for 3-15 seconds, and then is lifted at a constant speed, so as to obtain a heat exchanging tube for friction-deformation-diffusion welding of the circular-groove-assisted reinforcing tube plate. The method is applicable to tube plate welding.
Description
technical field [0001] The invention relates to a friction welding method, in particular to a friction deformation diffusion welding method of an annular groove assisted strengthening tube sheet. Background technique [0002] Heat exchangers occupy an important position in many industrial productions such as chemical industry, petroleum, and food, and are widely used. The tube-plate structure is currently the most widely used form of heat exchanger. This structure is often connected by expansion joints, welding and expansion welding. Due to the long-term axial load generated by the pressure difference on the tube joints, many times Due to the effects of repeated cooling, heating, high pressure and medium corrosion fatigue damage, the quality of the nozzle weld is particularly important, especially the mechanical properties and sealing. Expansion joints rely on the plastic deformation of the pipe to achieve sealing and mechanical connection. Creep at high temperature release...
Claims
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