Aluminum Door and Window Frame Laser-Welded Joint Assembly

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Solution Overview

Problem

Existing door/window fixtures made of aluminum or its alloys suffer from mechanical connection weaknesses over time, leading to deformation and difficulty in opening and closing, and visible joint lines that affect aesthetic appearance.

Innovation Solution

A door/window fixture with laser-welded joints between profiles and brackets made of the same aluminum alloy, eliminating visible joint lines and enhancing structural integrity.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of manufacture

If mechanical connection between profiles is used, then ease of manufacture is improved, but reliability deteriorates over time due to weakening connections and deformation

Engineering Contradiction:

Improveease of manufactureVSAvoidreliability

Core Design Contradiction:

Ease of manufactureVSReliability

Solution Approach 1:

The patent merges mechanical connection with laser welding to create a hybrid joint system. The mechanical connection provides immediate structural integrity and ease of assembly, while the laser welding adds permanent bonding that prevents loosening over time. This combination resolves the contradiction by maintaining manufacturing simplicity while dramatically improving long-term reliability and resistance to deformation.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The patent employs a composite joining approach combining two different connection methods (mechanical fastening and thermal welding) in a single joint system. This composite strategy leverages the advantages of both methods: the mechanical aspect provides ease of assembly and disassembly, while the welded aspect provides permanent strength and reliability, thus resolving the contradiction between ease of manufacture and reliability.

Inventive Principle:

Principle #40Composite materials

2Ease of manufacture

If profiles are connected with visible joint lines, then ease of manufacture is improved, but aesthetic appearance deteriorates

Engineering Contradiction:

Improveease of manufactureVSAvoidaesthetic appearance

Core Design Contradiction:

Ease of manufactureVSShape

Solution Approach 1:

The patent combines mechanical connection with laser welding to create a hybrid joint system. The mechanical connection provides immediate structural integrity and ease of assembly, while the laser welding adds permanent bonding that prevents loosening over time. This combination resolves the contradiction by maintaining manufacturing simplicity while dramatically improving long-term reliability and resistance to deformation.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The patent applies color matching between the weld material and the aluminum profiles to minimize visual impact. By selecting weld filler material that closely matches the profile color and using appropriate welding parameters to control weld bead appearance, the aesthetic impact of visible joint lines is significantly reduced, resolving the contradiction between ease of manufacture and aesthetic appearance.

Inventive Principle:

Principle #32Color changes

3Ease of operation

If repeated opening and closing operations are performed, then ease of operation is improved, but reliability deteriorates due to mechanical connection weakening

Engineering Contradiction:

Improveease of operationVSAvoidreliability

Core Design Contradiction:

Ease of operationVSReliability

Solution Approach 1:

The patent applies beforehand cushioning by pre-reinforcing the mechanical connections with laser welding before the door/window fixture undergoes repeated opening and closing operations. This preventive measure ensures that the connections are already strengthened and protected against the cumulative stress of frequent use, maintaining reliability while allowing ease of operation.

Inventive Principle:

Principle #11Beforehand cushioning (Prior cushioning)

Solution Approach 2:

Inventive Principle:

Principle #5Merging (Combining)

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 laser-welded joints provide enhanced robustness and durability, ensuring smooth operation and maintaining aesthetic quality over time.

Implementation Method 1

at least one first additional laser-welded joint between the first and second profiles and/or at least one second additional laser-welded joint between at least one of said first and second profiles and the bracket

Methodology Applied

Scientific EffectLaser welding: Laser Beam Welding

Implementation Method 2

using the same material allows the laser welding process to melt the bracket and both profiles uniformly, without differences in melting or cooling behaviour

Methodology Applied

Scientific EffectMelting: Melting

Data Source

PatentEP4696858A1Door/window fixture

Publication Date: 2026.02.18 PROFILATI SPA UNIPERSONALE

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AI summary

The door/window fixture (1, 1001) comprises a fixed frame (2, 102) and a movable frame (3, 103), wherein at least one of the fixed frame (2, 102) and the movable frame (3, 103) includes a first metal profile (9a, 10a, 11a, 12a, 1009a, 1010a, 1011a, 1012a), particularly made of aluminum or aluminum alloy, a second metal profile (9a, 10a, 11a, 12a, 1009a, 1010a, 1011a, 1012a), also particularly made of aluminum or aluminum alloy, at least one laser joint between the first profile (9a, 10a, 11a, 12a, 1009a, 1010a, 1011a, 1012a) and the second profile (9a, 10a, 11a, 12a, 1009a, 1010a, 1011a, 1012a), and optionally at least one mechanical joint (5) between the first profile (9a, 10a, 11a, 12a) and the second profile (9a, 10a, 11a, 12a), including a metal bracket (4), particularly made of aluminum or aluminum alloy.