Friction Welding Speed Control for Uniform Interface Temperature
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Solution Overview
Problem
Existing friction welding methods struggle to accurately control welding temperature, leading to non-uniform temperature distribution at the interface, which is particularly problematic in dissimilar metal bonding where it affects joint strength and intermetallic compound layer formation.
Innovation Solution
The method involves setting the maximum sliding speed during friction welding to 53 mm/sec or less, ensuring a temperature rising rate difference of within 10°C/sec between the center and outer peripheral portions of the interface, and maintaining a maximum temperature difference of 50°C or less between these areas, thereby achieving uniform temperature distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If conventional friction welding methods are used, then welding can be performed on various metal members, but the welding temperature cannot be accurately controlled, resulting in non-uniform temperature distribution at the interface
Solution Approach 1:
The invention changes the sliding speed parameter to 53 mm/sec or less, which fundamentally alters the heat generation characteristics during friction welding. This parameter change enables accurate temperature control and achieves uniform temperature distribution across the welded interface, resolving the contradiction between performing welding operations and maintaining temperature uniformity.
2Productivity
If high sliding speed is used during friction welding, then welding process is faster, but the temperature rising rate difference between center and outer peripheral portions increases, causing non-uniform temperature distribution
Solution Approach 1:
The invention sets the sliding speed to 53 mm/sec or less, which is a significant reduction from conventional high sliding speeds. This parameter change slows down the welding process but achieves uniform temperature distribution by reducing the temperature rising rate difference between center and outer peripheral portions to within 10°C/sec.
3Strength
If carbon content of high tensile steel is kept low (0.1 wt% or below), then hardening at peripheral portion is suppressed, but the range of applicable materials is extremely narrow
Solution Approach 1:
The invention changes the controlling parameter from material composition (carbon content) to process parameter (sliding speed). By setting sliding speed to 53 mm/sec or less, the invention achieves hardness uniformity and suppresses peripheral hardening without restricting material selection, thereby resolving the contradiction between strength control and material versatility.
4Strength
If welding temperature is reduced in friction welding, then softening of thermally affected portion is suppressed, but temperature distribution uniformity at interface is not maintained
Solution Approach 1:
The invention changes the sliding speed parameter to 53 mm/sec or less, which simultaneously achieves both low welding temperature and uniform temperature distribution. This parameter change suppresses softening of the thermally affected portion while maintaining temperature uniformity across the interface, resolving the contradiction between joint strength and temperature distribution.
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 allows for precise control of welding temperature, resulting in a uniform temperature distribution across the welded interface, which enhances joint strength, suppresses the formation of brittle intermetallic compound layers, and prevents defects in dissimilar metal bonding.
Implementation Method 1
a solid phase bonding (friction bonding) method where heat generation phenomenon due to friction is utilized
Data Source
AI summary
The objective of the present invention is to provide a friction pressure welding method with which the welding temperature can be controlled accurately, the welding temperature can be lowered, and the distribution of the welding temperature at an interface to be welded can be made uniform; and to provide a welded structure obtained by this method. The present invention relates to the friction pressure welding method in which one member is abutted against another member and is made to slide in a state in which a welding pressure substantially perpendicular to the interface to be welded is applied, said friction pressure welding method being characterized in that the maximum sliding speed is no greater than 53 mm/sec, the difference in the temperature increase rate between a center portion and an outer peripheral portion at the interface to be welded is 10° C./sec or less, and the difference between the maximum attained temperature between the center portion and the outer peripheral portion at the interface to be welded is no greater than 50° C.