This video is a follow-up demonstration of a Denali laser welder, created to address viewer skepticism from a previous video. The primary focus is to verify weld integrity through destructive cut and etch testing. The video compares the laser welder against traditional TIG welding on both 80-thousandths-inch stainless steel and quarter-inch aluminum. The results demonstrate the laser's substantial speed advantage, completing welds more than five times faster than TIG in the examples shown. More importantly, the cut and etch tests on both materials confirm that the laser achieves deep, solid root penetration, refuting the concern that it might only be laying down a superficial "caulk bead." A final side-by-side comparison on aluminum showed the laser weld achieved significantly better penetration than a TIG weld of a comparable size. As far as I can tell from the visual evidence presented, the technology appears to perform as claimed for these specific applications.
Laser Welding vs. TIG: Speed and Penetration Analysis
00:00 Addressing Skepticism: The video's purpose is to respond to viewer comments demanding "cut and etch" tests to prove the laser welds are not just superficial beads but have proper penetration.
01:50 Speed Comparison on Stainless Steel: A lap joint on 80-thousandths (2mm) stainless steel is completed in 9 seconds with the laser, while a comparable TIG weld takes 50 seconds. This is a speed increase of over 500%.
02:26 "Scale Mode" Feature: The laser has a setting called "scale mode," which wobbles the lens to create a weld with a rippled, "stack of dimes" appearance, aesthetically similar to pulsed TIG welding.
03:39 The Central Question: Penetration or "Caulk Bead"? The video directly addresses the core concern of whether the laser is achieving true fusion deep into the root of the joint or simply laying filler material on the surface.
06:33 Speed Comparison on Aluminum: On a 6-inch-long, quarter-inch aluminum lap joint, the laser takes 11 seconds. The same weld performed with TIG takes 59 seconds, again demonstrating a greater than 5x speed advantage.
06:58 Stainless Steel Cut and Etch Result: Destructive testing of the stainless steel weld reveals a solid weld nugget with good fusion into the root, comparable to what would be expected from a quality TIG weld.
07:56 Aluminum Cut and Etch Result: Tests on the quarter-inch aluminum show excellent, deep penetration. Both the standard and "scale mode" welds are confirmed to have solid fusion.
09:15 Direct Laser vs. TIG Penetration Test: The final test compares a laser weld and a TIG weld on the same piece of aluminum. The results show the laser weld achieved a near-perfect, deep weld nugget, while the TIG weld, intentionally kept small to match the laser bead profile, had significantly shallower penetration.