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Welding method of vertically brazed joint of stainless steel conduit

A technology of brazing joints and welding methods, which is applied in the welding field of vertical brazing joints of stainless steel conduits, and can solve problems affecting product quality, etc.

Inactive Publication Date: 2011-10-26
SHENYANG AIRCRAFT CORP
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  • Description
  • Claims
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Problems solved by technology

[0003] This method has been widely used in actual production, but there are still incomplete penetration of the welding zone on the upper part of the brazing joint in the vertical direction of the stainless steel conduit, and there are also defects such as air holes and solder bumps, which directly affect the quality of the product

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  • Welding method of vertically brazed joint of stainless steel conduit
  • Welding method of vertically brazed joint of stainless steel conduit

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Embodiment Construction

[0014] A welding method for brazing joints in the vertical direction of stainless steel conduits, characterized in that the steps are as follows:

[0015] 1) Preparation of the joint surface before brazing: matt nickel plating is carried out within a length not less than 50mm from the end of the conduit. After nickel plating, the surface is a uniform, matte dark silver-white surface, and the thickness of the nickel plating layer is 6-9mm. , the outer diameter tolerance is d-0.05 -0.1mm, the surface roughness is not less than Ra3.2mm;

[0016] 2) Preparation of solder ring: the thickness of the solder ring is 0.25mm, and the width is 1.5-3mm;

[0017] 3) Preparation of the casing: nickel-plate the surface of the casing completely, and the inner diameter of the casing after nickel plating is D+0.1+0.05mm, and the rest are the same as the requirements of the catheter;

[0018] 4) Assembly between parts: the conduit is sleeved in the casing, and the offset relative to the center ...

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Abstract

The invention relates to a welding method of a vertically brazed joint of a stainless steel conduit. The method comprises the following steps: 1) preparation of the surface of the joint before brazing; 2) preparation of a brazing filler metal ring; 3) preparation of a sleeve; 4) assembling of parts; and 5) welding. In the welding method of the vertically brazed joint of the stainless steel conduit mainly, a method of replenishing the brazing filler metal ring for welding over the joint before welding is adopted; and the method can be used for reducing the defects of the vertically brazed joint and improving the quality of products.

Description

technical field [0001] The invention relates to a welding method for a vertical direction brazing joint of a stainless steel conduit, which is used for welding the stainless steel conduit in the vertical direction. Background technique [0002] Conduit high-frequency induction brazing is divided into two types: installation type and fixed type. Conduit installation high-frequency induction brazing is to place the workpiece in an induction heater filled with argon, use soft induction coils to heat, rely on coaxial cables to transmit high-frequency energy over long distances, and use photoelectric signals to control the brazing temperature to achieve closed-loop control brazing method. Conduit fixed high-frequency induction brazing is a brazing method in which the workpiece is placed in a vacuum argon-filled box, heated by a single-turn or multi-turn induction coil, and the relative position of the hard induction coil and the workpiece is manually controlled. [0003] This m...

Claims

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Application Information

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IPC IPC(8): B23K1/002B23K1/20B23K3/00
Inventor 佟庆暹
Owner SHENYANG AIRCRAFT CORP
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