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Welding points when manufacturing tinplate cans

Welding points when manufacturing tinplate cans

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(5) Welding points when manufacturing tinplate cans
Posté sur: 02/10/2022
Par Tin can Best

For the application of food cans, high air tightness and strong corrosion resistance are required to ensure that the food in the can will not leak or corrode the can, which is a higher requirement for the manufacturing process and welding process. Especially in the welding process, it is necessary to pay special attention to the following points.

tin can

1. When manual or machine arc welding is used for tinplate cans, the welding current should be selected within the current range specified in the electrode specification. Due to the large resistance value of the iron can, a section of the electrode near the clamping end is likely to turn red due to resistance heat. When the electrode is welded to the second half, the melting speed is accelerated, and the penetration depth of the weld is reduced, but the melting speed is too fast. It constitutes a disadvantage such as not being fused. From the perspective of ensuring the corrosion resistance of the joint, it is also required to select a smaller welding current to reduce the welding heat input and prevent the welding affected area from overheating.

2. In the operation skill specification, it is required to select narrow channel, multi-layer and multi-pass welding skills. When the tank is welded, try not to shake the electrode. This not only reduces the heat input, but also facilitates the precipitation of gas and improves the intergranular resistance of the welded joint. Corrosive ability.

3. The bottom may be deformed during the process of loading the machine, so you must pay attention. When laying the bottom, the bottom should be close to the backing plate, and the contact point should be fixed firmly, so that the backing plate and the bottom plate are deformed together.

4. The bottom plate should be welded once under the same temperature conditions. As a rule of thumb, due to the difference in temperature between day and night, the shortening deformation can be very violent, affecting the ovality of the base plate. Therefore, we must seize the opportunity to control the temperature.

In addition, in order to prevent hot cracks when welding iron cans, it is also necessary to choose a high-quality hydrogen electrode with low carbon content, and to have a slow arc end to form a crescent shape. arc-shaped. It is best to master the arc extinguishing distance, and perform the next welding before the last arc point turns dark red. Generally speaking, mastering these precautions can produce high-quality tinplate cans.

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Publié dans: Connaissance technique

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  • plastic caps/ lids/ covers and handles
    Par :Ficon Sur 03/07/2022
    Évaluation:
    5.0

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