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Anonymous users2024-02-08Why there is such slag inclusion in vertical fillet welding, tell you the reason and method, and you will understand it immediately.
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Anonymous users2024-02-07Causes of slag inclusion in welding:
1. The slag between the edge of the weldment, the weld layer and the weld bead is not removed. Especially with alkaline electrodes, if the slag is not removed, it is more likely to produce slag inclusions.
2. The welding current is too small, and the heat obtained by the molten metal and slag is insufficient, which reduces its fluidity, and the solidification speed of the molten metal is fast, and the slag does not have time to float out.
3. During welding, the angle of the welding rod and the method of transporting the rod are inappropriate, and the slag and iron moisture can not be distinguished, which mixes the slag and the molten metal together, and hinders the floating of the slag.
4. Improper chemical composition of base metals and welding materials.
Extended Materials. Slag inclusion can be divided into linear, isolated and other forms according to its forming.
Slag inclusion will reduce the plasticity and toughness of the weld; Its sharp corners often cause stress concentrations, especially in welds with a large air quenching tendency, and cracks often form at the apex of the sharp corners. Often, under the action of stress, cracks will appear first at the slag inclusion in the weld and stretch along, resulting in a decrease in strength and cracking of the weld.
Slag inclusion is a type of solid inclusion defect and is the slag remaining in the weld.
In protective casting, the root cause of slag inclusion is due to the instability of the mold level. Therefore, the inappropriate depth of the nozzle insertion and the sudden change in pulling speed will cause fluctuations in the liquid level of the crystallizer, and in severe cases, lead to slag inclusion. In terms of the content of its slag inclusions, there are unmelted powdery protective slags, inclusions that can be absorbed by liquid slag in the future, and high-viscosity protective slags that absorb and dissolve excess AL.
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Anonymous users2024-02-06Because there must be enough solder to ensure the quality of soldering, otherwise it may cause incomplete soldering, voids, etc., so the excess solder will become solder.
Welding is the cause of grinding that produces welding slag:
1. There are oil, rust, paint and other sundries on the surface of the base metal, which burn during the welding process, hindering the flow of molten iron, making the molten iron too dispersed and appearing to have more slag.
2. The welding current is too small, the arc blowing force is small, the molten iron is mixed together, and the temperature is too low and the slag is not blown to both sides of the weld, which makes it appear that there is more slag.
3. When the welding rod is damp, the coating absorbs too much water, which affects the protection effect during the welding process and leads to excessive slag.
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Anonymous users2024-02-051. The root cleaning after root welding is not thorough, resulting in the failure to completely overflow the root slag during rapid thermal welding.
2. The method of root welding is improper, so that the grooves on both sides of the root weld bead are too deep and present a "W" shape. During rapid heat welding, the slag flowing into the deep groove does not have time to overflow and slag inclusion is formed.
3. If the arc is closed too fast at 6 o'clock, it is easy to produce slag inclusion.
Preventive measures: After the root welding, use a grinding wheel to remove the slag, the root cleaning should be thorough, and each joint point must be flat. When cleaning the root, the root weld bead should be cleaned into a "U" shaped groove, and avoid cleaning into a "W" shaped groove.
At 6 o'clock, the molten pool should be filled, and then the arc should be transported to the formed weld for arc retraction, and the flat throwing method should be used to extinguish the arc.
Extended Materials. Slag inclusion is a kind of solid inclusion defect, which is the slag residue left in the weld, which can be divided into linear, isolated and other forms according to its forming.
It is generally similar to the stomata but more irregular in shape, and sometimes there are needle-shaped microscopic slag inclusions, which are in a variety of shapes. The hazards of slag inclusion to the weld are similar to porosity, and the slag inclusion will reduce the plasticity and toughness of the weld. Its sharp corners often cause stress concentrations.
Especially in welds with a large tendency to air quench, cracks often form at sharp apex. The stress concentration caused by sharp corners is more severe than that of porosity, and even similar to cracks.
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Anonymous users2024-02-04There are many factors for the formation of welding slag inclusions, if there are many inclusions in the welding materials (including base metal, gas and welding consumables, etc.), it will inevitably cause inclusions in the weld; In addition, process factors also have a great influence on welding slag inclusions.
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Anonymous users2024-02-03Is the weld always slag included? The reasons are these two points, and it is very simple to grasp them.
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Anonymous users2024-02-02Spot welding, which belongs to resistance welding.
Series. Using electrode pressurization, the electrode is formed into a nugget through low voltage, high current, and short time. There is no spatter at all.
Electric welding, in a narrow sense, is electrode hand arc welding. After welding, the welding slag needs to be removed after the welding slag has completely cooled.
If the slag inclusion in the weld is a welding defect.
It is usually caused by factors such as moisture in the welding rod, too small welding current, improper balance transportation bar, and dirty surface of the base metal.
Slag inclusions are not allowed for important parts. It is necessary to use an angle grind to break up the machine.
Wait for the tool to grind and punch the shed to remove the slag inclusion part, and re-repair the welding.
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Anonymous users2024-02-01How to solve the phenomenon of slag inclusion in time if there is a phenomenon of slag inclusion in the process of electric welding? 1 little trick to teach you.
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Anonymous users2024-01-31Why does steel bar welding vertical welding love slag inclusion in the middle? It is mainly caused by these two reasons, let's learn from the master.
Because they're different.
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