Welded Junction Structure for Small-Hole High-Strength Joining

Solution Overview

Problem

Existing joining structures face insufficient joining strength due to a small welding area of the filler material, particularly when the hole diameter of the penetrating part is small.

Innovation Solution

A joining structure that includes a first member with a penetrating part, a second member with a corresponding penetrating part, and a third member with a flange that presses the peripheral edge of the second member, where the third member is arc-welded to the inner peripheral surface of the first member and the opening surface of the second member, increasing the welding area and securing joining strength through solidification contraction.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Volume of moving object

If the hole diameter of the penetrating part is small, then the structure is more compact, but the welding area of the filler material becomes small and joining strength becomes insufficient

Engineering Contradiction:

Improvestructure compactnessVSAvoidjoining strength

Core Design Contradiction:

Volume of moving objectVSStrength

Solution Approach 1:

The invention transitions from single-point welding through the penetrating part to multi-dimensional welding by contacting the inner peripheral surface and the opening surface of the penetrating part, effectively utilizing both the lateral surface area and the end surface area for welding attachment.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

Solution Approach 2:

The invention changes the welding parameters by utilizing both the inner peripheral surface area and the opening surface area of the penetrating part, transforming the welding configuration from a single-point contact to a multi-surface contact that increases the effective welding area while maintaining a compact structure.

Inventive Principle:

Principle #35Parameter changes

2Volume of moving object

If the hole diameter of the penetrating part is small, then the structure is more compact, but the welding area of the filler material becomes small

Engineering Contradiction:

Improvestructure compactnessVSAvoidwelding area

Core Design Contradiction:

Volume of moving objectVSArea of stationary object

Solution Approach 1:

The invention transitions from single-point welding through the penetrating part to multi-dimensional welding by contacting the inner peripheral surface and the opening surface of the penetrating part, effectively utilizing both the lateral surface area and the end surface area for welding attachment.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

Solution Approach 2:

The invention changes the welding parameters by utilizing both the inner peripheral surface area and the opening surface area of the penetrating part, transforming the welding configuration from a single-point contact to a multi-surface contact that increases the effective welding area while maintaining a compact structure.

Inventive Principle:

Principle #35Parameter changes

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

The increased welding area of the filler material enhances the joining strength between the first, second, and third members, effectively addressing the issue of insufficient joining strength in small diameter penetrating parts.

Implementation Method 1

The third member is arc-welded, via the second penetrating part, to an inner peripheral surface of the first penetrating part of the first member and an opening surface of the first member opened by the second penetrating part of the second member

Methodology Applied

Scientific EffectArc welding: Welding

Implementation Method 2

The second member is compressed by the flange and the first member by solidification contraction of the third member, and the second member is therefore fixed between the flange of the third member and the first member

Methodology Applied

Scientific EffectSolidification contraction: Thermal Contraction

Data Source

PatentUS12179296B2Junction structure

Publication Date: 2024.12.31 PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO LTD

AI summary

Second member (20) includes a material that is difficult to weld to first member (10). First member (10) is provided with first penetrating part (11) penetrating in a thickness direction. Third member (30) is arc-welded to an inner peripheral surface of first penetrating part (11) and opening surface (10a) of first member (10) via second penetrating part (21) of second member (20). Second member (20) is compressed by flange (31) and first member (10) by solidification contraction of third member (30), and second member (20) is therefore fixed between flange (31) of third member (30) and first member (10).