Friends all welcome. Often in everyday life have sufficiently thin weld metal, because most of square tubes of metal which are cooked and the area in the country or has a thickness of 1.5-2mm. For most people, taking their first steps in the manual arc welding work with such thickness has a number of difficulties. And so I want to show and tell about your technique welding of thin metal, which will help even a novice to win the thin metal!
For a visual example, we take a plate thickness of 1 mm and make it cut round grinders, which has a thickness of 1.2 mm. We need to cut emitatsii butt joint thin-walled tube. Although shaped tubes are slightly thicker than the plate, but we will not look for easy ways to show how this welding technology.
In textbooks recommend welding thin metal plate welded on the thick copper-lined for easy removal of heat from the welding zone in order to avoid instant burn-through, but then again, where in everyday life we take these plates, and so we will be welded as in real life, I put the plate on the cutting profile pipes.
Here at this picture I show the thickness of the plate, focus on the old course fotike leaves to be desired, but if you zoom in, you can consider dividing shtangeltsirkulya.
Starts with the first welding point, it is very important to do it carefully, slowly, so as not to burn through metal. The first point we do is fatter, several times by melting metal in one place. Then, as very gently and leisurely ignition electrode at this point, and just a little bit, just a few millimeters, will conduct the arc in the direction of the future of the joint, as if this point of lengthening. And so point by point, light the electrode begins to fade when the previous point and move a little arc on. What is the essence of this method? We aim arc in this case is not on the base metal to 1 mm, which is very easy to be burned, and the weld, which has already a sufficient thickness, and so slowly moving forward.
for analogy I took disks for grinder and arranged them in a form on which to form our weld, make a point with a small extension in the direction of the future of the seam.
That's all we brewed the cut made on the plate in 1mm. Seam certainly get far from perfect, but the welding was not easy.
For this example, I used to rutile electrodes, 3mm thick, naturally better for this plate could take 2mm, but I did not have them, so we had three. Polarity reverse, + on derzhak. Brewed back angle, ie, I tilted from the vertical in the direction of electrode movement. A current of approximately 70 was plus or minus a few amperes. But these figures are guided not worth it, especially a novice, I brought them just for a specific example of what to do.
That's the way it is possible to weld thin enough metal manual arc welding. But do not try to immediately proceed to the desired product weldable without work-out with a similar thickness to unnecessary lronburg picking up welding current and the speed of movement of the electrode.