Induction Weld Bead Shaping to Prevent Humping
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Solution Overview
Problem
Conventional metalworking processes, such as welding, cladding, and additive manufacturing, face challenges with unwanted shaping of weld beads due to gravitational forces, leading to increased stress concentrations and reduced productivity, particularly in high-speed welding operations where 'humping' occurs, complicating the formation of favorable toe angles and requiring time-consuming machining processes.
Innovation Solution
The application of an electromagnetic force using an induction coil to shape molten metal beads during the metalworking process, allowing for the creation of weld beads with favorable toe angles and reduced stress concentrations in a single pass, thereby eliminating unwanted shapes and improving weld quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If conventional welding processes are used, then weld beads are formed, but unwanted shaping occurs due to gravitational forces causing sharper toe angles and stress concentrations
Solution Approach 1:
The patent replaces mechanical machining processes with an electromagnetic field-based induction heating system. The induction coil generates an electromagnetic field that selectively heats and reshapes the weld bead toe regions, eliminating the need for mechanical intervention while achieving precise control over toe angles and reducing stress concentrations.
Solution Approach 2:
The invention changes the physical state and temperature parameters of the weld bead material using induction heating. By controlling the heating parameters (frequency, power, duration), the system selectively softens specific regions of the weld bead, allowing gravitational forces to be counteracted and the bead shape to be optimized for reduced stress concentrations.
2Manufacturing precision
If machining processes are performed to improve weld quality, then stress concentrations are reduced, but productivity decreases due to time consumption
Solution Approach 1:
The patent merges the welding process with a post-weld heat treatment process by integrating the induction coil system into the welding apparatus. This allows the weld bead to be reshaped immediately after deposition while the material is still warm and malleable, combining two operations into one continuous process and eliminating separate machining steps.
Solution Approach 2:
The induction heating system performs preliminary shaping of the weld bead immediately after welding while the material is still in a softened state. This preliminary action prevents the need for subsequent machining operations, as the weld bead is shaped to the desired configuration before complete cooling and solidification occur.
3Manufacturing precision
If grinding processes are used to improve weld quality, then surface quality improves, but hazardous debris is generated
Solution Approach 1:
The patent replaces mechanical grinding and abrasion processes with a thermal field-based induction heating system. Instead of mechanically removing material through grinding, the system uses controlled electromagnetic heating to selectively soften and reshape the weld bead, eliminating the generation of sparks, dust, and hazardous debris associated with mechanical grinding.
4Productivity
If high welding speeds are used to increase productivity, then output increases, but humping occurs limiting usable speed range
Solution Approach 1:
The induction coil system provides continuous post-weld heating and shaping action that compensates for the disruptions caused by high welding speeds. By maintaining continuous electromagnetic field application during and immediately after the welding process, the system ensures uniform heat distribution and prevents the periodic undulations (humping) that normally occur at high speeds, allowing sustained high-speed operation with consistent bead quality.
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 enables the production of fatigue-grade welds with improved toe angles and reduced stress concentrations, enhancing productivity by eliminating the need for additional machining and preventing 'humping' in high-speed welding, while maintaining control over the weld bead formation.
Implementation Method 1
an electromagnetic force is generated and applied on a molten metal bead while the bead is still sufficiently malleable
Implementation Method 2
Induction bead shaping enables favorable, fatigue grade welds to be created
Data Source
AI summary
A system, apparatus, and method in which an induction head is used to impinge an electromagnetic force field on a molten metal bead to shape same, e.g., to flatten same.