Pipe End Brazing Ring Positioning for Secure Flow-Safe Joints

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Solution Overview

Problem

Existing methods for brazing pipe end portions to counter members are inefficient, leading to waste of materials, high production costs, and inaccuracies in positioning the brazing filler metal, which can result in narrowed flow channels and incomplete connections.

Innovation Solution

A method involving the use of a ring-shaped engaging portion on the pipe end, with a brazing-filler-metal-made ring that is easily positionable and melted to secure the pipe end to the counter member, ensuring precise brazing at the desired position without excess material waste.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the pipe member and counter member are immersed in melted metal to cover the entire surface, then the connection is secure, but material waste increases and production cost rises

Engineering Contradiction:

Improveconnection securityVSAvoidmetal waste

Core Design Contradiction:

ReliabilityVSLoss of substance

Solution Approach 1:

The patent applies local quality by placing brazing filler metal only at the specific abutment portion where the pipe end portion contacts the counter member, rather than covering the entire surface. This is achieved by positioning the brazing filler metal between the outer peripheral surface of the pipe end portion and the inner peripheral surface of the counter member at the abutment portion, ensuring secure connection only where needed and reducing material waste.

Inventive Principle:

Principle #3Local quality

2Ease of manufacture

If brazing filler metal is provided without positioning, then the application is simple, but the filler metal shifts to incorrect positions during brazing

Engineering Contradiction:

Improvebrazing application simplicityVSAvoidbrazing position accuracy

Core Design Contradiction:

Ease of manufactureVSManufacturing precision

Solution Approach 1:

The patent applies preliminary action by pre-positioning the brazing filler metal at the abutment portion before the brazing operation. The filler metal is placed between the outer peripheral surface of the pipe end portion and the inner peripheral surface of the counter member at the abutment portion, ensuring it remains at the correct position during heating and brazing, thereby achieving both simple application and precise positioning.

Inventive Principle:

Principle #10Preliminary action

3Reliability

If excess metal remains at the connected part, then the connection is thorough, but the flow channel becomes narrowed

Engineering Contradiction:

Improveconnection thoroughnessVSAvoidflow channel obstruction

Core Design Contradiction:

ReliabilityVSObject-generated harmful factors

Solution Approach 1:

The patent applies local quality by limiting the brazing filler metal application to only the abutment portion where connection is needed, preventing excess metal from entering the flow channel. The filler metal is specifically positioned between the outer peripheral surface of the pipe end portion and the inner peripheral surface of the counter member at the abutment portion, ensuring thorough connection without obstructing the flow channel for liquid or gas.

Inventive Principle:

Principle #3Local quality

Applied Scientific Principles

This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.

Function Achieved in This Case

This method allows for secure, cost-effective brazing at the precise position, reducing material waste and ensuring accurate connections while minimizing flow channel restrictions.

Implementation Method 1

heating and melting the brazing-filler-metal-made ring of the pipe end portion in a state where the outer peripheral surface of the pipe end portion is brought into abutment with the inner peripheral surface of the counterpart member

Methodology Applied

Scientific EffectBrazing: Brazing

Implementation Method 2

heating and melting the brazing-filler-metal-made ring of the pipe end portion

Methodology Applied

Scientific EffectMelting: Melting

Data Source

PatentUS20070221708A1Method of brazing pipe member to counterpart member

Publication Date: 2007.09.27 USUI CO LTD

AI summary

This invention is intended to provide a method of brazing the pipe member to the counterpart member, in which the pipe end portion of the pipe member and the counterpart member can be certainly secured by brazing at the desired position while this brazing operation is performed at a low cost without time and troubles. A method of brazing a pipe member to a counterpart member by brazing an outer peripheral surface of a pipe end portion of the pipe member to an inner peripheral surface of the counterpart member, the method includes the steps of mounting in a circumferential direction an engaging portion in a ring shape to an outer periphery of the pipe end portion as a vicinity of a pipe endmost portion of the pipe member, disposing a brazing-filler-metal-made ring in a ring shape to the engaging portion in an engaging manner, inserting the pipe end portion of the pipe member provided with the brazing-filler-metal-made ring into the counterpart member, heating and melting the brazing-filler-metal-made ring of the pipe end portion in a state where the outer peripheral surface of the pipe end portion is brought into abutment with the inner peripheral surface of the counterpart member, pouring a brazing filler metal into an abutment portion between the outer peripheral surface of the pipe end portion and the inner peripheral surface of the counterpart member, and securing by brazing the pipe end portion to the counterpart member.