Inert Gas Weld Header for Low-Oxide Steel Seam Welding
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Solution Overview
Problem
Oxide formation during welding of steel sheets/plates leads to challenges in coating integrity and adherence, particularly during subsequent hot-dip metallic coating and processing operations like annealing and hot-stamping, as existing methods fail to effectively prevent oxidation.
Innovation Solution
A continuous seam welding system with a shielding and cooling header that directs a non-oxidizing gas, such as nitrogen or argon, onto the weld area to reduce oxide formation, using openings in the header to ensure even coverage and cooling to a temperature of 500°C or less to minimize oxide layer thickness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If steel sheets/plates are heated to high temperatures during welding, then the welding process can be completed, but oxide formation occurs on the weld surface
Solution Approach 1:
The patent applies an inert atmosphere principle by introducing a non-oxidizing gas (such as nitrogen or argon) through a shielding header positioned at the weld zone. This creates an inert environment that prevents oxygen from reacting with the hot steel surface, thereby eliminating oxide formation while maintaining high welding temperatures necessary for successful welding.
Solution Approach 2:
The patent uses a non-oxidizing gas as an intermediary substance between the oxygen-containing atmosphere and the hot weld zone. This intermediary gas layer acts as a barrier that prevents direct contact between oxygen and the heated steel surface, thus preventing oxidation without interfering with the welding process itself.
2Object-generated harmful factors
If a non-oxidizing gas is directed onto the weld area, then oxide formation is reduced, but device complexity increases
Solution Approach 1:
The patent merges two functions into a single integrated header component: (1) shielding function - directing non-oxidizing gas onto the weld area to prevent oxide formation, and (2) cooling function - directing cool gas to reduce the temperature of the weld zone. This combination eliminates the need for separate shielding and cooling devices, thereby reducing overall system complexity while achieving both protective and thermal management objectives.
Solution Approach 2:
The shielding header is designed as a multi-functional device that simultaneously performs shielding (preventing oxidation) and cooling (reducing weld zone temperature). By making the header universal in its capabilities, the patent avoids adding separate dedicated devices for each function, thus managing device complexity while providing comprehensive protection and control.
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
The system achieves a 30% reduction in oxide thickness, ensuring better coating adherence and weld quality by preventing thick oxide layer formation, thus enhancing the integrity of the weld area during subsequent processing.
Implementation Method 1
directs a non-oxidizing gas, such as nitrogen or argon, onto the weld area to reduce oxide formation
Implementation Method 2
cooling to a temperature of 500°C or less to minimize oxide layer thickness
Data Source
AI summary
An apparatus for use in a continuous welding system including a welding head configured to remain stationary relative to translating steel sheets or plates. The apparatus includes a hollow elongate body and a port. The body extends between two closed ends. The port is coupled to a non-oxidizing gas source and in communication with the body. The body defines a plurality of openings. The openings are configured to direct non-oxidizing gas towards the steel sheets or plates to simultaneously shield a weld formed by the welding head from atmosphere and cool the weld.