Greetings to the channel for self-taught garage and summer cottages in welding and locksmiths. Here we share some simple work tips so you can apply them right away and get great results. Let others go the long way through trial and error!
So, when you need to make a joint at 90 degrees from shaped pipes. Such a joint will be strong and nice if the pipe ends are cut at 45 degrees for it. But often when cutting by hand with a grinder, what will happen is what is shown in the photo above.
Such gaps will be long and problematic to weld. It is better to make joints in profile pipes for welding with as little gaps as possible, especially if the pipes are thin.
The option with a chainsaw is certainly good, but not everyone has such a tool. So we will focus on cutting by hand with a grinder. The most important thing here is correct markup.
To prepare for the joint, I will take 2 pieces of a profile pipe with dimensions of 20 by 40 mm.
Let's examine the end of the pipes. We want the flange cut to be exactly 90 degrees to the pipe axis. It happens that the very end of one of the shelves is not entirely even, it will not work that way, or we grind it down with a grinder or look at the other end of the shelf. Here we have chosen a flat end at the shelf. From it we will throw the markup. This can be said to be the apex of the tip after cutting.
I usually do all the markings with a blue chemical pencil. But the markings for cutting a 45-degree pipe should be very thin, a pencil does not go here.
The marking line should be less than or equal to the thickness of the disc at the grinder with which we will cut. After all, it will be boring for us to follow the disc exactly according to the markup.
Otherwise, if the marking is thicker, then we may slightly deviate in one direction or another and the cut may it turns out a little wrong, hence the large gaps - from both pipes by a small mistake and the result is not very. What to do, what to mark?
There are special carbide scribes for metal, the line from them is very thin and clearly visible. But if such a tool is not at hand, then we apply a little trick.
A piece from a grinder's disc cut off. We break it in half, that's it, the thin marking tool is ready for our purpose.
We mark it, we draw a piece of disk along the ruler several times. The main thing here is that the line goes out clearly on the edge of the shelf.
You can see these markings with a piece of the disc very well, as if we will guide the disc along them when cutting. We made markings on both sides, the third shelf, if the pipe is not large, you don't need to do it. Here we cut off without marking, connect the notches from the first markings.
When we cut off the unnecessary part, we look at the cut point, it should be in the same plane, there should be no protruding parts. If something protrudes slightly from the common plane, then we immediately undermine it with the same disc.
We cut, we cut, we grind, now we look at what joint it turned out. We fix both pipes on the magnet in a 90 degree position. The magnet is powerful, it holds the pipes tightly, everything will be very clear.
The joint turned out to be quite good for manual cutting with a grinder. There are some small gaps, but they are acceptable and will not cause problems in subsequent welding. For clarity, let's compare 2 photos.
If you follow these simple recommendations in the article, then instead of the first photo you will always get the result of the second photo and even better!
Take it to your tech arsenal.