Remote Laser Welding Method Integrating Preliminary Fixation and Main Welding
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Solution Overview
Problem
In remote laser welding, large objects cannot be fully welded within the scanning range of the laser beam, requiring multiple movements of the scanning unit, which increases the number of steps and can lead to thermal distortion and residual stress causing defective welding.
Innovation Solution
A laser welding method where preliminary-fixation welding and main welding are performed within the scanning range of the scanning unit, reducing the number of times the unit needs to travel and restraining the object to prevent deformation and positional deviation by main-welding between already welded and preliminary-fixation-welded areas.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If preliminary-fixation welding and main welding are performed as separate processes requiring multiple scanning unit movements, then welding quality can be maintained through proper restraint, but the number of welding steps increases and productivity decreases
Solution Approach 1:
The patent combines preliminary-fixation welding and main welding into a single continuous scanning process. The scanning unit performs both welding operations in one pass by controlling the laser beam to alternately execute preliminary-fixation welding at predetermined positions and main welding at other positions within the same scanning range, eliminating the need for multiple separate movements and reducing the total number of welding steps while maintaining welding quality through proper restraint at each stage
2Area of stationary object
If the scanning unit moves multiple times to cover large welding areas, then the entire object can be welded, but thermal distortion and residual stress increase causing defective welding
Solution Approach 1:
The patent applies preliminary-fixation welding at predetermined positions before performing main welding across the entire area. This preliminary action creates restraint points that prevent excessive thermal distortion and residual stress buildup during subsequent main welding operations, allowing large areas to be welded without defective welding while minimizing harmful thermal effects through staged welding approach
3Manufacturing precision
If preliminary-fixation welding is performed before main welding with separate scanning unit movements, then positional deviation can be prevented, but the welding process time increases
Solution Approach 1:
The patent maintains continuous scanning unit movement throughout the welding process, performing both preliminary-fixation welding and main welding in a single uninterrupted pass. This continuous action prevents positional deviation by maintaining consistent restraint while eliminating idle movement time between separate welding operations, thereby reducing total welding process time while preserving manufacturing precision
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 reduces the number of steps necessary for welding while preventing defective welding by integrating preliminary-fixation and main welding processes, ensuring both sides of the weld are restrained, thus minimizing deformation and positional deviation.
Implementation Method 1
welding a plurality of metal plates by applying a laser beam scanned by a scanning unit to the plurality of metal plates
Implementation Method 2
a laser beam guided from a laser oscillator
Implementation Method 3
scanning (i.e., directing in various directions in an orderly manner) a laser beam
Data Source
AI summary
A laser welding method for welding a plurality of objects to be welded by applying a laser beam scanned by a scanning unit to the plurality of objects to be welded while moving the scanning unit in a welding direction along a welding path, the laser welding method including the steps of: performing a step of preliminary-fixation-welding on a predetermined place in the welding direction of the objects to be welded, and a step of main-welding on a place corresponding to the preliminarily-fixed place of the object to be welded within a scanning range of the scanning unit while moving the scanning unit. Further, when the place corresponding to the preliminarily-fixed place of the object to be welded is main-welded, the place is main-welded in a state where both sides of the place to be main-welded are restrained.