What metal materials can laser welding machines weld?
Stainless Steel: A primary application area for laser welding, covering the full power range from 0.3mm thin plates to 8mm thick plates. Stainless steel is the most mature material for laser welding—it has moderate laser absorption, low thermal conductivity, easy molten pool establishment, and good weld formation. It can cover the full power range of 1500W-6000W for ultra-thin plates (0.3mm) to medium-thick plates (8mm), producing a bright, silvery-white weld with a delicate fish-scale pattern, requiring no grinding and passing inspection directly. Stainless steel is a fundamental material for laser welding machines; poor stainless steel welding indicates a problem with the equipment.
Carbon Steel: Deep penetration welding efficiency for thin and medium-thick plates far exceeds traditional welding methods, achieving single-pass penetration without beveling. Carbon steel has high laser absorption, making welding easier, but traditional welding methods require beveling and multiple filler layers for thick plates, resulting in low efficiency. Laser deep penetration welding of 10mm carbon steel achieves single-pass penetration without beveling; the welding speed for thin plates is 3-5 times that of TIG welding. Carbon steel is the material where laser welding best demonstrates its efficiency advantages.
Copper and Brass: From a restricted area to a regular welding area for highly reflective materials, the key lies in optical path protection and power window. Copper is a notoriously difficult material to weld with lasers—copper’s reflectivity is over 95%, making it impossible for ordinary welding machines to penetrate and even burning the fiber optic cable. Yttrium Laser’s dedicated high-reflectivity optical path directs reflected energy, achieving deep penetration and dense welds in copper and brass welding at power levels above 1500W. Copper’s transformation from a highly reflective restricted area to a regular welding area relies entirely on proper optical path protection and the correct power window selection.
Aluminum Alloys: The three major challenges of rapid heat conduction, high porosity, and blackening are comprehensively solved by galvanometer oscillation and a dedicated parameter library. Aluminum welding faces three major hurdles—rapid heat conduction, difficulty in establishing a molten pool, high weld porosity, and insufficient removal of surface oxide film leading to weld blackening. Yttrium Laser’s galvanometer oscillation welding stirs the molten pool, forcibly venting and suppressing porosity. The dedicated aluminum alloy parameter library precisely matches power, speed, and protective gas parameters, resulting in silvery-white, dense welds with a porosity of less than 0.5% for aluminum plates ranging from 0.5mm to 5mm thick.
Galvanized Steel Sheet: The nemesis of zinc vapor spatter is oscillating welding, resulting in stable weld formation and significantly reduced spatter. The biggest enemy in galvanized steel sheet welding is the zinc layer—zinc’s boiling point is much lower than steel’s melting point, causing violent zinc vaporization during welding, leading to spatter, porosity, and poor weld quality. Oscillating welding with a galvanometer spot first evaporates the surface zinc before welding the substrate, resulting in orderly release of zinc vapor without explosive spatter, stable weld formation, and significantly reduced spatter, allowing for clean welds even on galvanized steel sheets.
Dissimilar Metals: Copper and steel, and aluminum and steel can be welded, but process matching is required. It’s not that welding is impossible, but the parameters must be correct. Copper-steel dissimilar welding and aluminum-steel dissimilar welding are the most in-demand but also the most challenging applications—the large difference in melting point and thermal conductivity between the two metals easily leads to the formation of brittle intermetallic compounds (IMCs). Yttrium Laser’s dedicated process parameter library for dissimilar metals controls heat input offset and cooling rate to suppress excessive IMC layer growth, ensuring the strength of copper-steel and aluminum-steel dissimilar weld joints meets usage requirements.