Laser Welding Layout With Opposite-Side Preheating for Crack Prevention
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Solution Overview
Problem
In laser welding devices, the configuration of the preheating device is restricted by the laser irradiation unit when both are disposed above the object, limiting their size, installation angle, and distance, which can lead to inefficiencies and increased risk of cracking, particularly at the end edges of the weld.
Innovation Solution
A laser welding device design where the heating device is positioned on the opposite side to the welding laser irradiation unit, allowing it to preheat the target portion from the opposite side, thereby preventing the configuration restrictions and effectively addressing the risk of cracking by focusing heat on the end edges.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If both the laser irradiation unit and preheating device are disposed above the object to be welded, then the preheating function is provided, but the configuration of the preheating device is restricted by the laser irradiation unit, limiting size, installation angle, and distance
Solution Approach 1:
The heating device is moved from the same side (above) the object to the opposite side (below) the object, changing the spatial dimension of arrangement. This allows the heating device to be positioned without interfering with the laser irradiation unit above, thereby resolving the configuration restrictions while maintaining preheating effectiveness
2Productivity
If the preheating device is positioned to avoid contact with the laser irradiation unit, then the laser beam path is maintained, but the preheating efficiency and ability to focus heat on end edges is reduced
Solution Approach 1:
Instead of positioning the heating device above the object (same side as laser), the heating device is inverted to the opposite side (below the object). This inversion allows the heating device to focus heat directly on the end edges from below without being constrained by the laser irradiation unit, simultaneously improving welding efficiency and crack prevention capability
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 design enhances the efficiency of the welding process by preventing configuration restrictions and effectively reducing the risk of cracking at the end edges, while maintaining control over the preheating temperature and timing to ensure high-quality welds.
Implementation Method 1
a welding laser irradiation unit that faces the object, the welding laser irradiation unit welding the object by irradiating a target portion of the object with laser light
Implementation Method 2
a heating device disposed on an opposite side to the welding laser irradiation unit seen from the object, the heating device preheating the target portion by heating the target portion from the opposite side
Data Source
AI summary
A laser welding device that welds an object to be welded including two or more members includes: a welding laser irradiation unit that faces the object, the welding laser irradiation unit welding the object by irradiating a target portion of the object with laser light; and a heating device disposed on an opposite side to the welding laser irradiation unit seen from the object, the heating device preheating the target portion by heating the target portion from the opposite side.