How to weld the excavator with a large back break facing the sky?

1. I am also engaged in construction machinery, 2. The arm of our 650 type was also broken a few days ago.

3. I'll tell you how to weld to the sky (that is, to weld up).

4. The first bevel should be handled well and polished very cleanly.

5. Choose a small diameter electrode.

6. Multi-layer multi-pass welding is adopted, that is, welding one by one.

7. Each layer and each weld should not be too wide and thick, and weld slowly.

8. The middle of each layer and each weld should be cleaned and slag can not be included.

9. Each layer and each weld joint should be staggered.

10. If you need to preheat, you must preheat it, if it is 100-150 degrees of Q345.

11. Keep warm after welding.

1. You can choose MG600 welding rod to weld, cold welding, and control the welding speed.

2. MG600 is a kind of high-efficiency, high-strength chromium-nickel alloy electrode (welding wire) with a wide range of generalization, with excellent plasticity, toughness and crack resistance, and is suitable for almost all kinds of common steels. It has excellent welding process performance, stable arc, easy slag removal, less spatter, and uniform and beautiful weld. Usage:

It is suitable for welding tools and molds, high-speed tool steels, hot work tool steels, manganese steels, cast steels, T-1 steels, seismic steels, vanadium-molybdenum steels, spring steels, martensitic stainless steels, austenitic stainless steels, ferritic stainless steels, unknown steels, and welding between various types of steels. For example, it is used for high-pressure valves, the removal of broken bolts, the modification of shafts, etc., and the effect is very ideal.

3. Welding: also known as welding and grafting, is a manufacturing process and technology that joins metals or other thermoplastic materials such as plastics in a heated, high-temperature or high-pressure manner.

To preheat up, about 200 degrees, use nickel-based electrodes, and weld by hand.

This must be sloped at the joint, slowly welded from the inside to the outside, and remember not to use steel plates to make up.

1. The welding place must be cleaned before welding.

Second, a certain amount of preheating should be carried out before welding.

3. Suitable welding materials must be selected when welding.

Fourth, welding penetration must be ensured.

The electrode model is important. If you want to understand what material is made, you have to take some iron foam for testing, and the test will come out, and then distribute the electrode according to the composition. J507 welding rod is enough, the tensile strength is 50 kg, it is just a kind of structural steel.

If you have used 507 before and can ensure that the weld penetration is still cracked, it is recommended that you change to J607. It should be enough.

It must be cleaned before welding (that is, the original cracked welding meat is removed, and the carbon arc gouging is used if possible, but the iron oxide must be polished clean after planing) If possible, it is also necessary to preheat the welding position by 100 degrees. Then use the diameter electrode to weld, stop after a while, use a hammer to hit the weld and the edge of the weld, and keep hitting it with a hammer until the weld is basically cooled. The aim is to relieve the welding stress, as heat treatment is not possible after welding.

When welding, it is necessary to ensure that the weld is penetrated, and if the gap in the weld position is large, a backplate can be added inside.

If you can't weld the steel plate, you should frustrate the fracture clean, and then point the steel plate into molten steel, or molten iron, fill the seam, and finally weld the steel plate Remember that the steel plate is welded more than the fracture! Submit an answer.

In fact, it's not that complicated You are talking about the big arm is talking about the big square iron sheet in front of the cab seat or the big arm hydraulic arm If it is said that the big arm is broken, you can buy a hard enough steel plate to weld it But the disadvantage is that the pipe is not long But it can still be used If it is the hydraulic arm that is broken, there is no need to repair it It is directly recommended to change it Because the hydraulic pressure is broken, it is not impossible to repair it, but the price of repair is about the same as the price of the replacement And it will not take long to repair it It's just a big arm You can find a piece of hardness enough to weld it just now, but it is best to weld it on all four sides, without affecting the activity of the hydraulic rod, the excavator industry is a profiteering industry, some things can not be excavated, repair shops do not go, I hope it will be useful to you.

Oxygen welding sweeps out the hole, welds it on the electric weld, and then adds the steel plate, OK

It's better to change it, because the cost of repairing it is not much lower.

The crack of the excavator arm should be repaired by manual arc welding, but first of all, you should understand what kind of steel the small arm was originally made of to determine the grade of welding rod that should be used for repair.

Then use an angle grinder (or carbon arc gouging) to repair (plane) the welding groove along the crack, and then weld the repair, in order to ensure that the crack repair welding has sufficient strength, a reinforcing plate should be welded

If you have to weld, you can choose MG600 welding rod, use a small process, intermittent welding, and pay attention to control welding deformation.

You just need to find a professional welder, on the back of the crack in the forearm with an oxygen cutting gun, cut out a round hole, and then the welding personnel will weld the crack from this hole, to add iron plate burning, after the welding is done, the round hole is welded, and finally the front of the crack is welded, it is best to use a mill to grind a groove in the welding, because it is best not to add an iron plate on the front, which is very unfavorable to selling the machine in the future, at least 10,000 pieces less. Do it the way I do, as long as the welding is good and the paint is good, you can't see it, the used used mobile phones from Japan are doing this, and it is almost difficult to see the buyer.