Views: 0 Author: Site Editor Publish Time: 2026-05-09 Origin: Site
Welding of iron laminations is a manufacturing process that uses high temperatures to melt metal materials, bonding stacked laminations into an integral structure. The distribution of weld points and the resulting welding deformation directly affect the magnetic performance and structural stability of the core. In equipment such as motors and transformers, the core serves as a magnetic conducting component. Its welding quality must balance mechanical strength with magnetic circuit integrity to prevent operational abnormalities caused by unreasonable weld point layouts or excessive deformation.
The distribution of weld points must be designed according to the size and stress characteristics of the laminations. Common distribution methods include "circumferential uniform distribution" and "regional concentrated distribution":
Circumferential Uniform Distribution: This involves placing weld points at equal intervals around the outer circumference of the core. It is suitable for circular or toroidal laminations and helps reduce local stress concentration.Regional Concentrated Distribution: This method targets irregularly shaped cores, increasing weld point density in stressed areas such as corners and slots to enhance the structure's resistance to deformation.
The number of weld points requires a trade-off between connection strength and magnetic circuit loss. Too many weld points increase eddy current paths, while too few may lead to lamination loosening. Therefore, the layout needs to be optimized through simulation.
nding the weld point to expand rapidly; upon cooling, it contracts and generates stress. If this stress is unevenly distributed, it can easily cause core warping, flatness deviations, or increased interlaminar gaps.
Heat Source Selection: Laser welding has a smaller heat-affected zone (HAZ) and results in less deformation compared to arc welding.
Process Parameters: It is necessary to control welding current and speed to avoid prolonged heating. Additionally, employing a symmetrical welding sequence allows deformations on both sides to counteract each other.
Preventing welding deformation also requires considering the material properties of the laminations. Soft magnetic materials like silicon steel have low ductility, so heat input must be controlled during welding; pulse welding modes can be used to reduce heat accumulation. For thicker lamination stacks, preheating before welding can lower the material's temperature gradient. After welding, maintaining pressure with fixtures until cooling, or using local annealing to eliminate residual stress, can further inhibit deformation.
