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Fish Tail Defect in Can Welding

Introduction

Welding is an essential process in the manufacture of metal cans, since it allows joining the parts and ensuring the integrity of the container. One of the most common defects in can welding is fishtailing, which can cause problems in the subsequent handling of the can. In this technical article, we will discuss in detail how to solve the fishtail defect in can welding.

Definition of fishtail defect

Fishtailing is a weld defect characterized by the presence of material extending beyond the exit end of the weld. This defect can cause problems in the subsequent handling of the container, since it can generate weakness in the joint and affect the tightness of the closure.

Causes of fishtail defect

There are several causes that can lead to the appearance of fish tails in can welding, among which are the following:

  1. Excessive ferrule spacing
  2. Welding current too high
  3. Excessive welding force
  4. Incorrect adjustment of the calibration crown
  5. Inadequate position and speed of the outgoing conveyor

Solutions to fishtail defect

To solve the fishtail defect in can welding, it is necessary to address the causes mentioned above. The solutions corresponding to each cause are detailed below:

  1. Excessive ferrule gap: Adjust the wire speed and welder to achieve the correct gap. This will allow the welding to be carried out properly and avoid the formation of fish tails.
  2. Too high current: Reduce the welding current until a normal and regular extrusion is achieved. Excessive current can cause the material to extend beyond the exit end of the weld, generating the fishtail defect.
  3. Excessive welding force: Reduce the welding force to prevent the material from extending beyond the desired limit. Excessive force can cause deformation of the joint and lead to fishtails.
  4. Incorrect adjustment of the calibration crown: Check the tightness and condition of the calibration crown. Incorrect adjustment can result in uneven weld pressure and, as a consequence, the formation of fish tails.
  5. Improper outfeed conveyor position and speed: Adjust the position and speed of the outfeed conveyor to ensure proper material flow during the welding process. This will allow the weld to be made uniformly and avoid the formation of fish tails.

Conclusion

The fish glue defect in the can seam can cause problems in the subsequent handling of the can and affect the quality of the product. To solve this defect, it is essential to identify the causes and apply the appropriate solutions in each case. By effectively addressing the fishtail problem, a high quality weld will be guaranteed and the integrity and tightness of the package will be ensured.

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