Granular Refractory Material Welding Metal Containers

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Solution Overview

Problem

The manufacturing of metal containers, such as fuel tanks, is hindered by weld spatter and burrs that form inside the container during the welding process, which are labor-intensive to remove and increase production costs.

Innovation Solution

Filling the interior space of the container with granular refractory material, preferably marble chips of 3-4 mm size, before welding to prevent burrs and spatter formation, while also reducing porosity and cooling time.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Strength

If welding is performed to join metal plates, then the container achieves structural integrity and fluid tightness, but weld spatter and burrs are formed inside the container requiring labor-intensive removal

Engineering Contradiction:

Improvestructural integrityVSAvoidpost-weld cleaning

Core Design Contradiction:

StrengthVSEase of manufacture

Solution Approach 1:

A granular refractory material is introduced as an intermediary substance between the molten weld metal and the container interior surface. This material acts as a barrier that prevents weld spatter and burrs from adhering to the container walls, allowing for easy removal afterward and eliminating the need for labor-intensive cleaning operations

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The granular refractory material creates an inert environment within the container interior during welding. This refractory barrier prevents direct contact between the molten weld metal and the container surface, effectively isolating the welding zone from harmful thermal and mechanical effects that cause spatter and burr formation

Inventive Principle:

Principle #39Inert atmosphere (Inert environment)

2Manufacturing precision

If manual grinding is used to remove weld defects, then the container interior is cleaned of spatter and burrs, but labor costs and manufacturing time increase

Engineering Contradiction:

Improveweld qualityVSAvoidmanufacturing speed

Core Design Contradiction:

Manufacturing precisionVSProductivity

Solution Approach 1:

The granular refractory material is placed in the container before welding begins, performing a preliminary protective action. This pre-positioned barrier prevents defect formation at the source, eliminating the need for subsequent corrective grinding operations and maintaining high manufacturing productivity

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The refractory material absorbs the harmful effects of welding (heat, spatter, burrs) that would otherwise damage the container interior. By converting these harmful welding byproducts into easily removable loose particles, the process maintains weld quality while preserving manufacturing efficiency

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

3Manufacturing precision

If granular refractory material is used during welding, then weld spatter and burrs are prevented, but additional material handling steps are required

Engineering Contradiction:

Improveweld defect reductionVSAvoidprocess steps

Core Design Contradiction:

Manufacturing precisionVSDevice complexity

Solution Approach 1:

The granular refractory material functions as a disposable protective medium that is easily introduced and removed. Its low cost and simple handling characteristics mean that the temporary addition of this material and its subsequent removal do not significantly increase process complexity, while delivering substantial improvements in weld quality

Inventive Principle:

Principle #27Cheap short-living objects (Disposable)

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 results in high-quality welds with reduced porosity and burring, eliminating the need for post-weld defect removal, thereby saving time and costs while maintaining container integrity.

Implementation Method 1

its specific heat and thermal conductivity affect the cooling rate after welding is completed thereby reducing the time taken to complete the welding process

Methodology Applied

Scientific EffectThermal conduction: Conduction (thermal)

Implementation Method 2

An air layers is formed between the spatters and the surface of the coating films which prevents heat retained in the spatters from being easily transferred to the coating films and the welding members, thereby preventing adhesion of the spatters

Methodology Applied

Scientific EffectThermal insulation: Thermal Insulation

Data Source

PatentUS10265794B2Method of manufacturing metal containers

Publication Date: 2019.04.23 BLUE LEAF I P INC

AI summary

A method of manufacturing a container includes positioning metals plates against one another to define an interior space, filling the interior space with a granular refractory material and welding the seams between the plates to form a fluid tight container.