Oven Muffle Taphole Welding for Corrosion-Resistant Wall Joints
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional household appliance wall arrangements face challenges in achieving a durable and robust fastening of wall parts, particularly in appliances like ovens and dishwashers, where weld seams are prone to corrosion and dirt ingress, and accessibility issues complicate the attachment process.
Innovation Solution
A method involving taphole welding, where one wall part completely penetrates another, forming a weld seam visible on both sides, with a collecting space for weld material, ensuring a robust, gap-free joint and simplified attachment, especially suitable for oven muffle components, using plasma welding for high precision and corrosion resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If wall parts are welded together with conventional welding methods, then the attachment is achieved, but the weld seams are prone to corrosion and dirt ingress, reducing reliability
Solution Approach 1:
One wall part is inserted into the other wall part to form a nested arrangement, creating a collection chamber that captures weld material and prevents corrosion and dirt ingress at the weld seam interface
Solution Approach 2:
The weld material that would otherwise create vulnerable seams is redirected to flow into the collection chamber formed by the nested wall parts, transforming the harmful weld spillage into a beneficial sealing element that protects the joint
2Manufacturing precision
If complete penetration welding is performed to achieve robust weld joints, then weld quality improves, but the complexity of the welding process increases
Solution Approach 1:
The nested wall part arrangement is prepared in advance to form the collection chamber, which guides the weld material flow and simplifies the welding process by providing a predetermined path for complete penetration welding
Solution Approach 2:
The collection chamber acts as an intermediary structure that facilitates complete penetration welding by capturing and directing weld material, making the complex welding process more controllable and repeatable
3Strength
If wall parts are attached with overlapping sections to improve stability, then joint strength increases, but accessibility for welding becomes more difficult
Solution Approach 1:
Instead of making the welding side accessible, the design inverts the approach by allowing welding from the interior side where the welding device can access the overlapping section, while the exterior maintains a clean appearance
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 achieves a high-quality, robust weld connection with uniform clamping forces, enhancing the durability and corrosion protection of the appliance compartment while maintaining a low visual and cleaning impact, and simplifying the attachment of rear wall parts with poor accessibility.
Implementation Method 1
the wall parts are welded together
Implementation Method 2
using plasma welding for high precision and corrosion resistance
Implementation Method 3
a collection space for weld material
Data Source
Figure 1
Figure 2
Figure 3a~3b
AI summary
The invention relates to a domestic appliance, in particular, an oven, comprising at least two wall parts (16, 18) of the muffle, fixed together by means of a welded joint (34) and may concern a first tubular and a second wall piece in the form of a back wall of the oven muffle. According to the invention, a long-lasting and robust connection of the wall pieces to each other may be achieved, wherein the welded joint (34) extends through at least one of the wall pieces (18).