Why Wear-Resistant Plate Welds Distort
Laser welding is an efficient joining process, but its concentrated heat input causes deformation - and high-hardness wear-resistant plates (for mining, cement and power equipment) are particularly sensitive to thermal distortion. Controlling deformation is therefore a core part of welding quality for these materials.
Countermeasure 1: Optimize Process Parameters with Orthogonal Experiments
The orthogonal experiment method (a design-of-experiments technique) arranges multi-factor experiments efficiently, delivering valid results with fewer trials and identifying the best combination. For laser welding of wear plates:
Investigated factors: welding current, pulse width and laser frequency.
Response: welding deformation (minimize it).
Published example (specific to the source equipment/material - reference only): for a 10 mm plate, current in the 80-96 A range with frequency 2-5 Hz; influence ranking current > pulse width (~7 ms) > frequency (~3 Hz). For a 16 mm plate, reported optimum around 124 A, 8 ms, 4 Hz.
Countermeasure 2: Select the Orthogonal Table Correctly
The number of factors should match the level design of the orthogonal table, with fewer factors than table columns - a properly designed table gives statistically meaningful results.
Countermeasure 3: Range (Extreme-Difference) Analysis
Unequal ranges across columns show that different factors influence deformation to different degrees; the factor with the largest range dominates, guiding where to focus parameter control.
Countermeasure 4: FEA Simulation
Finite element analysis of welding temperature and stress fields predicts distortion before production, supports parameter selection, improves the stress balance of the plate, and avoids rework - a practical complement to experimental optimization.
Summary
Laser welding improves weld quality but demands deformation control. Use orthogonal experiments to find the best parameter combination for each thickness, verify with range analysis, and support the work with FEA simulation and proper fixturing/sequencing to keep distortion to a minimum.
