technical insight
slots, locating shoulders and folded positioning features can establish alignment during assembly. These features reduce reliance on operator skill, improve dimensional consistency and limit fixture complexity. When components can fit together in only one correct position, assembly is faster, more accurate and better suited to automation. Designers should also consider how the laser welding head will reach the joint. A well-designed joint is of little use if the welding head, optics or shielding gas system cannot access it effectively. Deep recesses, narrow channels and obstructed corners should be avoided or redesigned to provide clear beam access. Small geometric changes can reduce manufacturing complexity and improve welding consistency. Joint Design: The Foundation of Laser Welding Success Joint design is one of the most important considerations when designing stainless steel components for laser welding. Joint geometry affects heat flow, structural performance, weld quality, distortion and long-term corrosion resistance. For most sheet metal applications, butt joints are preferred. They eliminate overlap, reduce material use and provide a clean appearance. From a corrosion perspective, they avoid concealed crevices and are easier to clean, making them particularly suitable for hygienic, pharmaceutical and architectural applications. Butt joints demand accurate fit-up. Typical maximum gaps range from approximately 0.05 mm to 0.10 mm for thin sheet below 1.5 mm thick, increasing modestly for thicker sections. Consistent gaps are critical to achieving reliable penetration and fusion. Corner joints also perform well in laser-welding applications, particularly in enclosure manufacture and
folded sheet metal assemblies. Their clean appearance, combined with laser welding’s low-distortion characteristics, makes them suitable for cabinets, tanks and architectural products. Lap joints are simple to assemble but need careful consideration. The overlap creates a crevice that may trap moisture or contaminants. In hygienic or corrosive environments, lap joints should generally be avoided or fully sealed to prevent long-term corrosion problems. Designing for Distortion Control Reduced distortion is a major advantage of laser welding. The concentrated heat source produces narrow welds, small heat-affected zones and less thermal loading than conventional welding processes. Distortion is not eliminated, however, and still needs to be considered during design. The most effective control begins with geometry. Large, flat stainless steel panels are inherently flexible and susceptible to movement. Simple formed features such as flanges, swages, ribs and hat sections can increase stiffness with little impact on cost or weight. These features reinforce the structure and improve its resistance to thermal movement. Symmetry is also important. Components with balanced weld layouts tend to distribute thermal stresses more evenly, reducing the likelihood of distortion. Designers should consider weld placement from both a structural and thermal perspective. Symmetrical structures generally offer greater dimensional stability than asymmetrical designs. Unnecessary weld length should also be challenged. Excessive welding increases heat input, manufacturing time and distortion risk without necessarily improving structural performance. Efficient sheet metal structures use geometry, folds and stiffeners to carry loads rather than relying on excess weld metal.
23
Issue 4 – 2026
Made with FlippingBook - professional solution for displaying marketing and sales documents online