Laser seal welding metal on metal pipe metal cup suit for titanium 

1. Inner Tank Vertical Straight Seam Welding

The sheet metal is rolled into a cylinder, and a weld is applied vertically to form the inner tank body.

Location: Vertically along the inner wall of the inner tank

Function: To roll the stainless steel sheet into a cylinder

2. Inner Bottom Circumferential Weld

Circumferential weld between the inner tank body and the inner tank bottom cover; a circular weld seam is visible inside the inner tank.

Location: Around the inner bottom surface of the inner tank

Function: Seals the inner tank to hold water; if this weld leaks, the cup will leak directly

Process Key Points: Thin-walled (0.35–0.4 mm), laser circumferential welding; helium leak testing is mandatory

3.Mouth/Neck Weld (Most Important Weld)

The upper edge of the inner liner is welded to the upper edge of the outer shell, joining the inner and outer liners into a single unit and sealing the upper part of the vacuum chamber.

Location: At the rim of the cup, beneath the lid, where the inner and outer layers meet

Function: The sole sealing weld at the top of the vacuum chamber; even a microscopic leak will cause the vacuum to fail, resulting in a complete loss of thermal insulation

Characteristics: A circular weld bead is visible to the naked eye from the inside of the cup rim; the weld must be smooth and free of notches; laser welding causes less distortion and discoloration than TIG welding, requiring minimal grinding

4. Outer Bottom Weld

Welding of the outer shell body to the outer bottom cover; the weld around the very bottom of the cup

Location: Around the outer edge of the bottom of the cup; a circular weld visible from the outside

Function: Seals the bottom of the vacuum chamber and ensures the outer shell is airtight
 

5. Vacuum Evacuation Sealing (Evacuation Port Seal, Tail-Type / Tailless Vacuum)

Tail-Type Vacuum: A small metal tube protrudes from the bottom; after vacuum evacuation, the tube is clamped, sheared, and welded to seal the package. It has a metal tail that must be covered by the bottom cap. It is prone to damage and air leaks from impacts and is an older process.

Tailless vacuum: A small hole in the center of the outer bottom cover plate; after evacuation, the seal is fused at high temperature, with no metal tail; currently the mainstream export standard; there is a small dot on the bottom surface, protected by a bottom sticker; removing the sticker can easily damage the seal point, causing a vacuum leak.

Please contact us for customization and welding samples. We have many styles of laser welding machines,  

 Laser Welding Metal Cup