Laser Welding Tack Nugget Overlap to Suppress Plate Deformation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
During laser welding, deformation of the object to be welded occurs due to heat distortion and residual stress, and the tack welded parts are prone to peeling off after main welding, leading to abnormal noise and loss of strength.
Innovation Solution
A welding method where tack weld nuggets are formed along a virtual closed curve on the object to be welded, and main weld nuggets are overlapped on these tack weld nuggets to suppress deformation and prevent peeling, with the main weld nuggets encasing the tack weld nuggets to ensure no remaining tack weld parts after completion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If tack welding is performed before main welding to suppress deformation, then deformation suppression is improved, but the tack welded part peels off after main welding causing noise
Solution Approach 1:
The patent merges the tack welding process with the main welding process by positioning main weld nuggets to overlap with tack weld nuggets. This integration ensures that the weaker tack welded parts are reinforced or replaced by stronger main welds, preventing peeling while maintaining deformation suppression benefits throughout the welding sequence.
Solution Approach 2:
The patent applies preliminary tack welding at specific positions along a closed curve before performing main welding. This preliminary action establishes initial structural stability to suppress deformation during the subsequent main welding process, while the main welds are strategically positioned to eliminate remaining tack welded parts.
2Reliability
If main weld nuggets overlap tack weld nuggets, then peeling is prevented, but deformation suppression effect is lost
Solution Approach 1:
The patent segments the welding process into distinct tack welding and main welding stages, with tack welds performed at multiple positions along a closed curve before main welding. This segmentation allows the structure to gain incremental stability at each tack weld position, maintaining deformation suppression throughout the sequence while enabling complete overlap with main welds.
Solution Approach 2:
The patent performs preliminary tack welding at multiple positions before main welding to establish progressive structural stability. Each tack weld provides temporary reinforcement that suppresses deformation during subsequent operations, and the main welds are then applied to overlap and reinforce these preliminary tack welds.
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 effectively suppresses deformation during main welding and prevents peeling of tack welded parts after main welding, maintaining structural integrity and eliminating abnormal noise.
Implementation Method 1
a welding method for irradiating an object to be welded including a plurality of metallic plates that are stacked on each other with a high energy beam and performing welding
Data Source
AI summary
A welding method according to the present invention is a welding method for irradiating an object to be welded including a plurality of metallic plates that are stacked on each other with a high energy beam and performing welding. The welding method includes: forming a plurality of tack weld nuggets along a virtual closed curve on a part to be welded of the object to be welded; and forming a plurality of main weld nuggets so that the main weld nuggets overlap the plurality of respective tack weld nuggets.