Friends, I welcome everyone to our channel. Whoever is with us for the first time should know that this channel is for self-taught beginners in manual arc welding. Here we give only proven advice based on many years of welding practice. You will not find such recommendations in books.
Today I will tell you important information on how a beginner self-taught person can weld metals of different thicknesses to each other. For example, two plates with a thickness of 1 mm and 15 mm will be welded. Are you surprised? No, it is quite possible if you know the three basic rules for such welding.
Let's get started!
Friends, look, in the top 4 photos I showed the material that we have to weld. This is a 15mm thick plate, plus it is welded to the thick wall corner. And the plates are 1 mm thick, I cut them from an old electric box.
Rule one - we select the current for parts of greater thickness. If we do the opposite, then such welding will be problematic, the electrode will stick to the thick plate, and it will be difficult to achieve a normal connection.
The second rule, if the plates to be welded had the same thickness, then during welding we must keep the electrode in the middle, those at equal distances from the parts to be welded. But in the case of different thicknesses, the electrode should be tilted more towards the thinner metal.
In the photo above, we will imagine that the vertical shelf of the corner has a smaller thickness, so we tilt the electrode more towards this part. It's just that with this tilt, the energy of the weld pool will interact less with the thin metal, which is what we need.
The third rule is the rule of overlapping a weld in such welding. Here I drew (tried to draw!) An electrode, and a weld bead is formed behind it.
But the seam drawing in section, it has the shape of a smooth fossa, what does all this give us? See further.
The middle of the seam has the maximum penetration depth, this will be the maximum energy.
But towards the edges of the seam, the energy decreases, and the depth of penetration of the base metal decreases.
Therefore, when welding thin to thick, we only catch thin metal with the edge of the weld pool, so it will be welded to thick metal, and it will not burn through.
So we learned in theory the three main rules for welding thin and thick metal, let's get down to welding itself.
We put two potholders, in some places there was a gap, you will have to weld it too.
The seam was welded, there were no problems.
We beat off the slag and clean it with a metal brush, now everything will be clearly visible to us.
I took the welded parts outside, there is good natural light, and we can see that our welding of thin and thick metal turned out great.
We just knew these main rules, now you know them too, it's up to practice, and everything will be fine!
Friends, let's watch a video with the process of this welding. The video will complement the information I gave in the text.