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Soldering method of heterogeneous stainless steel oil injection nozzle nut of engine

A brazing method and stainless steel technology, which is applied to the brazing of dissimilar stainless steel fuel injector nuts of engines, and the brazing field of stainless steel fuel injector nuts, which can solve the problem of large grain size of stud parts, large welding heat cycle deformation, and hardness To avoid problems such as decline, to avoid grain growth, reduce thermal deformation, and reduce the effect of temperature field

Inactive Publication Date: 2013-02-06
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the problem that in the existing welding process, due to the large deformation of the welding heat cycle, the nozzle nut and the stud are improperly matched, resulting in product failure, and the existing brazing method cannot observe the solder ring. When the solder is wetted and spread during melting, the entire stud part is affected by the welding heat cycle, which leads to excessive grain size and decreased hardness, resulting in unqualified products, and then provides a kind of engine dissimilar stainless steel fuel injector nut. Brazing method and brazing device

Method used

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  • Soldering method of heterogeneous stainless steel oil injection nozzle nut of engine

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specific Embodiment approach 1

[0013] Specific implementation mode one: combine figure 1 Describe this embodiment, the brazing method of the engine dissimilar stainless steel fuel injector nut of this embodiment is as follows:

[0014] Step 1: removing the oxide film at the joint between the martensitic stainless steel stud 6 and the austenitic stainless steel nut 3, and then immersing the martensitic stainless steel stud 6 and the austenitic stainless steel nut 3 in acetone for ultrasonic cleaning for 30 minutes;

[0015] Step 2: Wind the HlCuNi30-2-0.2 solder into a ring to form an open solder ring 4, and immerse the open solder ring 4 in acetone for ultrasonic cleaning for 30 minutes;

[0016] Step 3: Coat the surface of the open solder ring 4 in step 2 with borax flux and assemble it with the martensitic stainless steel stud 6 and the austenitic stainless steel nut 3 in step 1. 3. Load the counterweight briquetting block 7 to obtain the part 10 to be welded consisting of the austenitic stainless steel ...

specific Embodiment approach 2

[0019] Specific implementation mode two: combination figure 1 To illustrate this embodiment, the method for removing the oxide film at the junction of the martensitic stainless steel stud 6 and the austenitic stainless steel nut 3 in step one of the present embodiment is: put the martensitic stainless steel stud 6 and the austenitic stainless steel nut The connection of the cap 3 is polished step by step with 80# water-sand sandpaper, 200# water-sand sandpaper, 400# water-sand sandpaper, and 800# water-sand sandpaper; the main parameters for ultrasonic cleaning of the weldment 10 immersed in acetone are: use ultrasonic The frequency is 60-80KHz, and the ultrasonic temperature is 30-45°C. The polished martensitic stainless steel stud 6 and the austenitic stainless steel nut 3 are convenient for ultrasonic degreasing and dewatering when immersed in acetone. Other method steps are the same as those in the first embodiment.

specific Embodiment approach 3

[0020] Specific implementation mode three: combination figure 1 Describe this embodiment, the brazing material HlCuNi30-2-0.2 described in the step two of this embodiment is composed of 27-30% Ni, 1.5-2.0% Si, 0.2% B and the Cu of the balance by mass percentage, The brazing filler metal is wound into a brazing filler metal ring by welding wire with a diameter of φ1mm, and the outer diameter of the brazing filler metal ring is 17.5-18.5mm. Such solder ring effectively guarantees its free sliding on the martensitic stainless steel stud 6 . Other method steps are the same as those in the first or second embodiment.

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Abstract

The invention provides a soldering method and device of a heterogeneous stainless steel oil injection nozzle nut of an engine, relating to a soldering device and a method for soldering an oil injection nozzle nut by using the same and solving the problem of product disqualification caused by oversize grain fineness and reduced hardness of the traditional soldering. The method for soldering the oil injection nozzle nut comprises the following steps of: removing an oxidation film positioned on the connecting position of a martensitic stainless steel screw stud and an austenitic stainless steel screw cap, and then immersing into acetone to ultrasonically clean for 30 minutes; immersing a solder ring into the acetone to ultrasonically clean for 30 minutes; coating sodium borate soldering fluxes on the surface of the solder ring to form a part to be soldered; and soldering the part to be soldered. The soldering device is characterized in that the martensitic stainless steel screw stud is arranged on a lower graphite cover plate; the austenitic stainless steel screw cap is arranged on the martensitic stainless steel screw stud; a counterweight pressing block is arranged on the austenitic stainless steel screw cap; and the solder ring is arranged between the martensitic stainless steel screw stud and the austenitic stainless steel screw cap. The soldering method and device disclosed by the invention are suitable for the soldering of oil injection nozzle nuts of various engines.

Description

technical field [0001] The invention relates to a brazing method for stainless steel fuel injector nuts, in particular to a brazing method for engine dissimilar stainless steel fuel injector nuts, and belongs to the field of induction brazing of dissimilar stainless steel material stud nut matching structures. Background technique [0002] As one of the important components of aircraft and automobile engines, the fuel injector will seriously affect the performance of the engine if its work is good or bad. There are high requirements for the hardness of the stud part and the tightness of the weld seam at the joint of the stud and the nut. With the development of related industries, the engine power is higher and the fuel efficiency is higher, all of which require higher quality and reliability assurance of fuel injectors. [0003] The welding part of the fuel injector nut is formed by connecting two parts, the nut and the stud. The connection of conventional dissimilar stain...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K1/002B23K1/20B23K3/08
Inventor 李卓然刘兵张相龙吴广东何国锐赵更一
Owner HARBIN INST OF TECH
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