Friends, all welcome. We continue the series of articles for anyone who decided to develop their own welding. And today is a very important and interesting theme is As a beginner weld seam under water to not flowed.
Sooner or later the man who has a welding have to cook something in the water. This may be tubes, shower tub, a tank, etc. under water. Seam under water should be dense and pore-free and slagging, otherwise it will leak. So, how to cook joints under water?
To illustrate an example, we take a small scrap piece of circular tube and sheet metal, and the scrap will try welded to the sheet so that the seam is not missed water.
To begin expose a small gap for better penetration and put some tacks. Welding electrodes will produce a coating in the rutile my case it will ano-21 (very poor as good can not say about them, their quality is quite unstable, sometimes come across quite good, and sometimes very bad).
Adjust welding current and the welding start, begin the welding need not on the tack, and a little away from her. Welding is performed with frequent detachment and re-ignition. So come to the most important, what kind of chip in which such joints under water will be obtained without leakage?
Many years ago, when I started to work as a welder, I was put to help the old welder who was cooking the pipe tapped into the water swivel joints. My function was quite simple-bring, give, get back do not bother me! But I took my mask, and when he was cooking, watching how he did it.
So, during the welding process he occasionally made strange action-electrode abruptly moved slightly backwards and sideways, it sharply dropped slides over the weld puddle slag welding arc. In the photo I showed this movement arrows.
Making this move is necessary to dramatically and at the same arc length as that of the current welding-lengthening is not necessary. Naturally, I adopted this method and quickly became a cook safely under water.
Here, our biggest problem is a liquid and very fluid slag at the electrodes with rutile covering it exactly as in the electrodes basic coating with slagging problems are much smaller, but such electrodes are used in everyday life novice quite problematic, since cook with a margin of hard-reignition is difficult, so it is popular electrodes with rutile covering- ANO-21, MP-W, MONOLITH, OK 46.
So that's such a simple, but important feature in welding under-lit water electrode, the weld pool warmed up a bit boil, and sharp movement back and sideways dropped the incoming slag, it is this action, we will not allow zashlakovka. Re-ignite the electrode at the point where finished and all are doing well, but need to control the time to the metal was still red, not quite faded, otherwise it's better with a hammer to fight off the slag in this place and then continue welding.
Still showed that it (called Castle) at welding under water is necessary to make overlap joints marker me. When I finished electrode and begin cooking the new, then you should start returning by 10 millimeters at the back seam. Or when connecting with the beginning of the seam, should also climb by 10 millimeters at the seam, and then break the arc, zaplaviv crater.
Well, let's see what we've got, pouring water until all the hot piece of pipe, when hot, if there is the smallest pores, then immediately begin to flow. It's all right out, no leaks.
In books on welding this information is not just lucky me, and was such a moment in which it happened to peek at an important piece of an experienced specialist, which I really handy. So try to do so, it will be much easier to avoid slagging.