Complete Kettle Body Production Line: Precision Manufacturing from Coil to Finished Product
As a small‑appliance equipment manufacturer with 15 years of experience, we not only produce kettles but also provide complete production lines and CKD solutions to customers worldwide. Today, we take you through the full process of a kettle body production line, explaining the technology and quality control behind every key step.
1. Raw Material Preparation & Inspection
The production process begins with material preparation. We source high‑quality stainless steel coils or sheets (commonly SUS 304 and SUS 430), valued for their corrosion resistance, formability, and aesthetic finish.
Key control points:
Material thickness is strictly selected (typically 0.4–0.6 mm)
Surfaces must be free from scratches and rust
Material certificates and batch traceability are maintained
Only after passing incoming quality control (IQC) are the materials released to the production line.
2. Blanking (Blanking / Disc Cutting)
Using a high‑speed stamping press (e.g., 80T blanking press) with precision dies, the stainless steel coil is stamped into circular blanks – the first step in shaping the kettle body.
Key control points:
Die precision directly affects blank dimensional consistency
A CNC servo feeder ensures accurate feed length for each stroke
Automatic scrap collection maximises material utilisation
Capacity reference: An 80T press can produce approximately 30 blanks per minute, or about 14,400 pieces per 8‑hour shift.
3. Bending (Edge Pre‑Bending)
The edges of the circular blanks are bent to create flanges that facilitate subsequent straight‑seam welding.
Equipment: Dedicated bending or flanging machine
Purpose: To align the two sides of the blank, ensuring a straight, strong longitudinal weld seam.
4. Longitudinal Seam Welding
The bent edges are welded together using a straight‑seam welder + TIG (argon arc) welder to form a cylindrical kettle body.
Process highlights:
Argon shielding prevents weld oxidation
Welding current, speed, and gas flow are precisely controlled
The weld must be smooth, pore‑free, and without burn‑through
After welding, semi‑finished bodies undergo visual weld inspection to check for cracks or undercuts.
5. Drawing (Deep Drawing)
A hydraulic press (e.g., 150T) with drawing dies transforms the cylindrical shell into a cup‑shaped body with a bottom and top curvature.
Process characteristics:
Depending on the body depth, multiple drawing steps may be required
Die design determines wall thickness uniformity and prevents tearing or wrinkling
Drawing lubricant application and cleaning are carefully managed
Note: Drawing is a critical step that directly affects dimensional accuracy and surface quality.
6. Trimming & Finishing
Bottom trimming: A press (e.g., 45T) removes excess material from the bottom edge to ensure a flat base.
Top trimming: The top edge (mouth) is cut to the design height, guaranteeing a level, round opening.
7. Stamping of Detail Features
Several presses are used to create specific features:
| Operation | Equipment | Purpose |
|---|---|---|
| Water level mark punching | 25T press | Stamps the water level window on the body |
| Lug (mazai) recess punching | 25T press | Forms recesses for later lug welding |
| Spout mounting hole punching | Dedicated press | Prepares the body for spout attachment |
8. Polishing
Two separate polishing steps are performed:
| Polish Type | Equipment | Purpose |
|---|---|---|
| External polishing | Double‑head automatic polisher | Removes drawing marks and scratches to achieve mirror, brushed, or matte finish |
| Internal polishing | Internal wall polisher | Smooths the interior surface for clean, odour‑free boiling |
The quality of polishing directly affects the product's final appearance grade, especially for premium kettles.
9. Spout Spot Welding
A multi‑claw automatic spot welder precisely welds the spout onto the designated position on the kettle body.
Process advantages (using the 45KW model as an example):
11 welding needles work sequentially for uniform weld points
High power (45KW) delivers black‑spot‑free, strong welds
Ideal for high‑end, natural‑finish stainless steel spouts that require no secondary polishing
10. Lug (Mazai) Spot Welding
A lug spot welder attaches metal lugs (mazai) to the body at the stamped recesses.
Application: These lugs are later used to secure plastic handles, decorative rings, and other components.
11. Crimping (Body-to‑Heating Plate Assembly)
A kettle body crimping machine rolls the bottom flange of the body onto the pre‑assembled heating plate, forming a secure, leak‑proof seal.
Process essentials:
Even pressure to ensure a tight seal
Minimal deformation
Leak‑tightness testing after crimping
12. Parts Assembly & Final Assembly
On an assembly conveyor line, the following operations are completed:
Installation of heating tube/element electrical connections
Installation of thermostat, power coupler
Attachment of plastic handle, lid, and base cover
Installation of switch and indicator lights
Electrical safety tests (hi‑pot, insulation, grounding)
Boiling function test
Every assembled kettle must pass final quality inspection before packaging and shipping.
Summary of Equipment for the Kettle Body Production Line
| Process Step | Main Equipment |
|---|---|
| Blanking | 80T press + CNC servo feeder + scrap reel |
| Bending | Bending/flanging machine |
| Longitudinal welding | Straight‑seam welder + TIG welder |
| Drawing | 150T hydraulic press (with multiple die sets) |
| Trimming/stamping | 45T presses (x3), 25T presses (x2) |
| Polishing | Double‑head external polisher + internal wall polisher |
| Spout spot welding | Automatic multi‑claw spot welder (25/35/45KW optional) |
| Lug spot welding | Automatic lug spot welder |
| Crimping | Crimping machine |
| Final assembly | Assembly conveyor + testing equipment |
Our Strengths
We are not only a manufacturer of kettle production line equipment – we also operate our own kettle factories. This dual perspective gives us a unique edge:
15 years of industry experience, with in‑depth knowledge of every process step
18‑person engineering team (10 in equipment design, 4 in R&D, 4 in after‑sales)
20+ successful projects worldwide, serving markets in Bangladesh, India, Vietnam, Turkey, Africa, and beyond
Dual identity – we know the equipment, and we know the production process inside out
Whether you are setting up a new complete line or a CKD assembly operation, we offer equipment, molds, installation, training, and ongoing technical support. Contact us today for a customised kettle production line solution tailored to your needs.
Quality Control
Quality control is an integral part of the kettle CKD production line. At every stage of the production process, quality checks are carried out to ensure that the kettles meet the highest standards. After assembly, the kettles undergo a series of rigorous tests. A water-filling test is conducted to check for any leaks, and the heating performance is measured to ensure that the kettle can heat water to the desired temperature within a reasonable time.
The electrical safety of the kettles is also thoroughly inspected. This includes checking for proper grounding, insulation resistance, and protection against electrical hazards. Any kettles that fail the quality control tests are sent back for rework or are scrapped.
Packaging
Once the kettles have passed all the quality control tests, they are ready for packaging. The packaging process is designed to protect the kettles during transportation and storage while also providing an attractive presentation for the end - user. The kettles are first wrapped in protective materials, such as foam or bubble wrap, to prevent scratches and damage.
They are then placed in custom - made cardboard boxes that include product information, instructions, and branding. The boxes are sealed and labeled, and the kettles are ready to be shipped to customers.
Advantages of Our Kettle CKD Production Line
Our kettle CKD Production Line offers several advantages. Firstly, it is highly customizable. We can adjust the production line to meet the specific requirements of different customers, whether it's the production capacity, the design of the kettles, or the level of automation.
Secondly, our production line is equipped with advanced technology and high - quality equipment. The use of state - of - the - art machines, such as the edge beading machine and induction brazing machine, ensures that the kettles are produced with high precision and quality.
Finally, we provide comprehensive after-sales service. Our team of experts is always available to offer technical support, maintenance, and training to our customers. This ensures that the production line operates smoothly and efficiently, minimizing downtime and maximizing productivity.
Conclusion
The production processes involved in the kettle CKD production line are complex and require a high level of technical expertise and precision. From material preparation to packaging, each step plays a crucial role in ensuring the quality and performance of the final product. As a leading supplier of the kettle CKD Production Line, we are committed to providing our customers with the best - in - class production solutions.
If you are interested in our kettle CKD production line, or have any questions regarding the production processes, feel free to contact us. We look forward to discussing your specific needs and exploring how our production line can help you achieve your manufacturing goals.