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Before welding, parts are always fastened with welding tacks. Tacks are a welding spot or a short seam. It is needed to rigidly fix these parts relative to each other in a certain position we need.
The welding point is made at a current slightly higher than the current of the main welding. By about 20 percent. This is necessary in order for the tack to melt the metal to a sufficient depth in a short time. It's just that the metal is initially cold and if you use the same current as when welding, then the desired penetration effect may not work.
But there is one more thing. The main welding seam cannot be started with a tack, why is this?
When the electrode starts to burn and a weld pool is formed, the tack just melts and ceases to perform its function. The meaning of this potholder simply disappears. The rest of the tacks are under stress with the metal (parts) and at this point in time a slight displacement may occur.
Such a hilarious analogy. Here are several people holding a large, heavy thing. They play the role of potholders for this thing to fix it in a motionless state!
The main welding seam, if transferred to this picture, will be as follows. A crowd of people will come up to help. And they will be included in the chain and in turn to support this detail.
But if initially one of these people simply lets go of the part so that a person from the crowd that comes up picks it up, then the part may tilt. So it is impossible, let him get close and help keep, and so will everyone else! Also with the start of welding directly on the tacks.
Also, before the main welding, the tacks need to be cleaned off with a grinder almost flush with the metal of the workpieces and when welding the seam itself it is good to remelt it with the seam metal. That's all for a little bit of information for beginners.
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