Greetings to all metal lovers!
Profftruba is the most demanded material in our time among garage and dacha craftsmen. Sometimes you have to join two or more pieces so as not to buy a new one. But often, after such welding, the docked pipe turns out to be a curve, even if it was assembled perfectly evenly on the tacks. I will tell you why and how to avoid it.
When welding, the weld seam has a certain volume, but as soon as it begins to cool, then its volume begins to decrease sharply, this is like an analogy with a snowball. When we take a handful of snow, it barely fits in our hand, but we start sculpting a snowball, then its volume becomes smaller, also with a weld.
We weld the first seam on either side of an exactly docked pipe, turn over and weld the opposite side, at this time the first seam shrinks and tightens the metal of the pipe, and the ends of the pipe seem to are fed towards the seam. But what about the second opposite seam, doesn't it compensate for the shrinkage of the first seam?
My practice has shown that after welding the ends of the pipe will bend slightly towards the first welded seam, the second seam does not compensate for this deformation.
Well, what to do? How to weld correctly? Let's watch a detailed video showing the whole process correct welding of a docked profile pipe.