The Difference Between Whether There Is A Weld in The Inner Tank Of A Stainless Steel Vacuum Flask

Whether there are welds in the inner liner of the stainless steel vacuum flask mainly depends on the production process used in the processing of the vacuum flask. When we buy a thermos cup, we will find that there are two weld lines on the inner wall of the thermos cup, one is straight to the bottom of the cup, the other is round at the bottom of the cup, and there are some weld lines on the inner wall of the thermos cup. No, what is the difference between the two?

In the thermos cup industry, there are two production processes: integral stretch forming and seam welding stretching. If you find that there are weld lines on the inner wall of the thermos cup, it means that it adopts seam welding. If there are no lines, it is seamless. Welded overall stretch.

The overall stretching process is a process of directly stretching a stainless steel seamless tube material into a thermos cup liner through a combined die. The process is simple, but the requirements for equipment and molds are high. If the overall stretching process is used to stretch the inner liner of the thermos, it will cost more materials and the cost will be higher. Sometimes if the height of the inner liner is too high, it cannot be stretched at one time, and it needs to be stretched twice or even three times to complete it. The advantage is that there is no welding and no welding seam can be seen, and it will look more beautiful and smooth.

The welding and stretching process is to use stainless steel plates through cutting, bending, rounding and other processes, and then use a special straight seam welding machine to perform argon arc welding. You will see straight welds, and the other is in the thermos cup The argon arc welding of the inner tank and the bottom of the inner tank needs to be completed with a special horizontal circular seam welding machine. This is the second circular weld. After the process is completed, use a vacuum flask inner tank leak detector to make a test whether If there is leakage of welding, then proceed to the next process of pressing and welding with the outer bladder.

For the second welding seam, most of the thermos cup manufacturers produced in Zhejiang are welded by the horizontal circular seam welding process, so two welding seams can be seen, and the bottom of the inner tank has an arc shape, which is easier to see clearly To the dirt, can be directly cleaned. The manufacturers of thermos cups in Guangdong are welded by vertical girth welding process. The bottom of the inner tank is a right angle, so only a straight welding seam can be seen with the naked eye. Therefore, the bottom welding seam stretching process can save materials and costs, and the design can be diverse. The disadvantage is that the welding seam does not feel very beautiful.

However, the two processes have little effect on the use and thermal insulation performance of the thermos cup. These two stretching processes do not have much difference in the use and thermal insulation performance of the thermos cup. The difference is in the raw materials, which is reflected in the purchase price. Cups will be more expensive, but this does not affect the use and thermal performance.