Welding Process: How We Seal and Shape the Inner & Outer Shells
After the bottle body forming stage, all semi-finished parts enter our welding workshop. This step is critical for building a stable vacuum structure and ensuring long-term insulation performance. Here’s how we weld each component with precision and consistency.
Installing the Getter Chip for Vacuum Performance
The first operation is welding a small stainless-steel getter chip onto the outer bottom.
Although tiny, this component plays a key role in vacuum insulation.
Once activated during later processing, it absorbs residual gas inside the interlayer, helping the bottle maintain a strong vacuum seal and stable temperature retention.
We weld the getter chip onto every outer shell to prepare it for the final vacuuming stage.
Welding the Inner Bottom
The inner tank and outer shell are paired in advance and delivered to the welding station.
Our operator places the stainless-steel inner bottom piece into a custom mold.
A pneumatic cylinder clamps the inner tank securely.
As the rotary platform turns, a high-precision laser welding head moves along the edge, forming a clean and uniform weld seam.
Within one rotation, the inner tank bottom is fully sealed and ready for assembly.
Welding the Mouth of the Bottle
Next, the inner tank is fitted into the outer shell, and the combined body enters the mouth-welding machine.
Once the operator starts the machine, the rotary system activates.
The laser torch travels around the rim, welding the inner tank and outer shell together at the mouth.
This step ensures structural integrity and is essential for creating the insulated double-wall chamber.
Welding the Outer Bottom
With the top sealed, the bottle moves to the final welding point—the outer bottom cover.
The operator places the bottom piece into the mold, and the machine performs a full-circle laser weld similar to the inner tank process.
In a short cycle time, the bottle’s main structure is fully formed, completing a stable double-layer stainless steel shell.
At this point, the bottle body is complete but still requires finishing.
Mouth Grinding & Surface Refinement
Fresh weld seams on the mouth area tend to be rough.
To ensure a smooth edge and proper fit for lids, we polish the mouth area to remove excess welding residue.
During this step, our team checks each mouth carefully to confirm:
The weld is continuous
The surface is clean
There are no gaps or pinholes
The dimensions meet tolerance standards
This preparation is necessary for the upcoming vacuum insulation process, which is the most critical stage in insulated bottle production.
Daily Output Capacity
Our welding workshop runs 24 hours with multiple stations operating simultaneously.
Under full production, we can complete up to 10,000 welded bottle bodies per day to support large-scale OEM/ODM orders.
Next Step
The next stage is the core of insulated bottle performance—Vacuum Insulation.
In the following page, we’ll show you how we create and maintain the vacuum layer inside every bottle.
If you have any questions about stainless steel bottle production or custom orders, feel free to contact us.
Follow each step to see how we produce stainless steel insulated bottles from raw materials to finished products.
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