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Today's article will show another desired welding chip and imenno- As the electrode can be removed (blow) old weld.
All this I will show you on a visual example. A few days ago there was a small repair welding semi-trailer, and that's where it was necessary to use this method.
It was necessary to replace the plate with holes in them inserted a bolt on which hang the pillow (in modern heavy duty vehicles, they instead of springs). Hole plate on the old developed a strong and therefore it was necessary to urgently make repairs.
On both sides of the plate (side and bottom) I made cuts in the old weld grinder, and from the other side crawl grinder was impossible, how to stop the wheel and wing. Of course, it was possible to remove the wheel from the wing, but this truck is not so quickly and easily, so that the weld old I had to blow welding.
Cut off the seam welding arc in this case will be from the top down, the seam we are vertical. The technique perform this action is quite simple.
Put more current, we direct the arc into the weld region, and warm up the point to the point where the metal begins to become fluid. And in this moment we are the point of the liquid as it podkovyrivaem electrode. Warms the next point, and podkovyrivaem again. And these actions we produce all along the old weld.
Here is a top view of the seam already deflated. Of course we are not completely separated plate as a grinder, but the seam has become very thin, and we can easily by prying plate chisel to break off her, arching on the remaining thin seam.
Won!
We throw out the old plate, and we clean the weld new.
This method I sometimes use to remove the old cast parts, crawl if the grinder has not given the opportunity. Method quite working, and in extreme cases without it anywhere.