Through-Hole Wall Assembly for Accessible Reverse-Side Welding

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Solution Overview

Problem

Welding components to the inner peripheral surface of tubular bodies or plate-shaped members is challenging due to deteriorated workability, especially when obstacles are present or the welding position is deeper than the opening end, leading to difficulties in accessing the welding site.

Innovation Solution

A through-hole is formed in the wall body, allowing the component to be fixed to one surface and welded from the opposite side, with the welded portion accommodated within the through-hole, improving accessibility and workability.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a component is welded to the inner peripheral surface of a tubular body from the inside, then the component can be fixed to block the through-hole, but the workability of welding deteriorates when the welding position is deeper than the opening end

Engineering Contradiction:

Improvecomponent fixationVSAvoidwelding workability

Core Design Contradiction:

ReliabilityVSEase of manufacture

Solution Approach 1:

Instead of welding the component from the inner side of the tubular body, the invention inverts the welding approach by welding from the outer side. The component is positioned from the inside to block the through-hole, but the welding operation is performed from the outside, reversing the conventional welding direction to improve accessibility and workability.

Inventive Principle:

Principle #13The other way round (Inversion)

Solution Approach 2:

The through-hole serves as an intermediary structure that allows the component to be positioned from the inner side while enabling welding access from the outer side. This intermediary configuration resolves the conflict between component positioning requirements and welding accessibility.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Adaptability or versatility

If an obstacle is placed to face the one surface of a plate-shaped member, then the obstacle may be necessary for functional reasons, but it blocks the welding path and deteriorates welding workability

Engineering Contradiction:

Improveobstacle placementVSAvoidwelding accessibility

Core Design Contradiction:

Adaptability or versatilityVSEase of manufacture

Solution Approach 1:

When an obstacle faces the surface where the component should be welded, the invention inverts the welding approach by welding from the opposite side. The component is still positioned to block the through-hole from the inner side, but the welding is performed from the outer side, bypassing the obstacle and restoring welding accessibility.

Inventive Principle:

Principle #13The other way round (Inversion)

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 enhances welding workability by enabling welding from a more accessible side, even in confined or obstructed spaces, thereby improving manufacturing efficiency and reducing the risk of leakage or obstruction in tubular structures.

Implementation Method 1

a welded portion welded to fix the component to the one surface is accommodated in the through-hole

Methodology Applied

Scientific EffectWelding: Welding

Data Source

PatentUS12460817B2Assembly, method for manufacturing assembly, burner, and method for manufacturing burner

Publication Date: 2025.11.04 MITSUBISHI HEAVY IND LTD

AI summary

This assembly comprises a wall body in which is formed a through-hole passing through in a thickness direction, and a component fixed to one surface of the wall body so as to cover the through-hole, a welded part welded so as to fix the component to the one surface being accommodated within the through-hole.