How to ensure the appearance and quality of welded joints

Generally speaking, there are several key points to forming a beautiful and solid weld pattern.
Firstly, the hand must be steady and not shaky, as this is directly related to whether the weld pattern is beautifully formed.
The thicker the steel plate, the longer the welding time, otherwise it is easy to weld through; conversely, the thinner it is, the more it can be done in one go to prevent welding through.
Third: the starting point welding and closing time should be mastered consistently, so that the welded out thing will be solid and can bear more weight.
Of course, the master leads the door, the practice depends on the individual, each person's approach is not the same habit, this kind of pull welding technology all flat personal skills and feel.
In the welding process, when a weld is finished, if the arc is pulled off immediately when closing, an arc pit will be formed below the surface of the weld.
The arc pit is too deep and can easily cause stress concentration and cracking, so the dwell time must be mastered and, also, we need to fill the arc pit at the finish.
Head-to-Head is a joint with the tail joint of the weld channel first, and this joint is the most used.
The head connection is a connection from the beginning of the first weld to continue welding head, requiring the first weld to start slightly before the arc, and a slightly longer arc, the arc will be pulled to the start and cover its end, with the start of the weld flat and then move in the opposite direction
The end-to-end connection requires the back weld to draw the arc from the end of the interface, weld to the end of the front weld, weld slightly slower to fill the arc pit and then weld a short section forward at a faster rate to extinguish the arc
The end of the weld is connected to the beginning of the first weld, using the high temperature at the end to repeat the melting of the beginning of the first weld, the weld will be welded flat and then quickly closed.
The essence of the end of the weld is how the arc is levelled at the end of the weld.
There are several general closing methods as follows.
(1) circle closing method: the welding rod moved to the end of the weld, a circular motion, until the arc pit is filled and then pull off the arc. This method is suitable for thick plate closing.
(2) Repeatedly break the arc closing method: when the welding rod moves to the end of the weld, the arc is repeatedly extinguished at the arc pit, the arc is drawn several times until the arc pit is filled. This method is generally suitable for thin plate and high current welding, but alkaline welding rod should not use this method, because it is easy to produce porosity.
(3) Back welding closing method: the welding rod moved to the end of the weld that stop, and change the angle of the welding rod back to weld a small section. This method is suitable for alkaline welding rod.
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