Metal Cored Electrode Indium Slag Removal

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Solution Overview

Problem

In gas metal arc welding, slag islands often form at the toes of welds, making them difficult to remove and potentially leading to corrosion or cosmetic issues if not properly cleaned.

Innovation Solution

The addition of indium and/or indium compounds to the fill composition of metal-cored electrodes facilitates the formation of slag deposits away from the weld toe, allowing for easier removal by promoting self-detachment or easy removal of slag islands.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If metal-cored electrodes are used to increase productivity and deposition rates, then welding efficiency is improved, but slag islands form at the weld toes that are difficult to remove

Engineering Contradiction:

Improvedeposition rateVSAvoidslag removal ease

Core Design Contradiction:

ProductivityVSEase of operation

Solution Approach 1:

The patent modifies the chemical composition parameters of the core fill material by adding specific elements (Ti: 0.05-2.00%, Nb: 0.05-2.00%, V: 0.05-2.00%) to change the physical and chemical properties of the slag,使其更容易从焊缝表面去除

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent uses a composite core fill composition combining iron powder with multiple alloying elements (Mn, Si, Ti, Nb, V, etc.) to create slag with improved removal characteristics while maintaining welding productivity benefits

Inventive Principle:

Principle #40Composite materials

2Reliability

If shielding gas is used to protect the weld from atmospheric contamination, then weld quality is improved, but slag islands still form and require additional cleaning time

Engineering Contradiction:

Improveweld qualityVSAvoidcleaning time

Core Design Contradiction:

ReliabilityVSLoss of time

Solution Approach 1:

The patent converts the harmful effect of slag formation into a beneficial outcome by designing the slag to form in removable configurations through specific alloying additions, transforming the cleaning burden into an easily removable situation

Inventive Principle:

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

3Reliability

If slag islands form at the weld toes, then they provide some protection during welding, but they become wedged in and very difficult to remove after welding

Engineering Contradiction:

Improveweld protectionVSAvoidslag removal difficulty

Core Design Contradiction:

ReliabilityVSEase of manufacture

Solution Approach 1:

The patent changes the chemical composition parameters of the slag-forming elements to alter the slag's physical properties such as viscosity and surface tension, enabling it to be easily removed after welding while maintaining protective function during welding

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

This approach significantly improves the ease of slag removal, maintaining weld quality and appearance while reducing the time and expense associated with slag cleanup, without compromising the mechanical properties of the weld.

Implementation Method 1

Methodology Applied

Scientific EffectSurface tension modification: Surface Tension

Data Source

PatentUS9149891B2Wire electrode with improved slag properties

Publication Date: 2015.10.06 LINCOLN GLOBAL INC

AI summary

A metal core electrode used to form weld deposits having improved slag forming properties with respect to reduced accumulation of slag in toes of the weld bead. The metal cored electrode includes a metal rod and a fill composition. The electrode includes a slag-modifying additive that contains metallic indium and/or one or more indium compounds.