Finding a solution to the bubbles that are created during welding in Aluminum. sahar gordo levin shaked cohen farjon
After welding, porosity is created in the welding area - lots of bubbles which weaken the material and cause weak welding, cracks and corrosion.
1. Use a higher quality welding rod and a higher welding current. 2. Ensure the welding area is clean and free of dirt, rust, oil, and grease. 3. Use a higher welding speed. 4. Use a gas shield when welding. 5. Use a backing strip or filler material when welding. 6. Use a post-weld cleaning process to remove any remaining porosity. 7. Ensure the welding area is properly ventilated.
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Shrinkage during the process of solidification of the metal and trapping of air and undissolved hydrogen
Shrinkage during solidification can be minimized by controlling the rate of cooling and solidification. This can be done by controlling the rate of heat transfer from the molten metal to the mold, as well as controlling the size and shape of the mold. Additionally, reducing the amount of air and undissolved hydrogen in the molten metal can help to reduce shrinkage. This can be done by using degassing techniques such as vacuum or inert gas purging, or by using fluxes or
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The welding process may produce gases such as hydrogen, carbon dioxide and steam, when welding is performed and the metal melts and solidifies these gases may be trapped.
The best way to eliminate these gases is to use a fume extractor. A fume extractor is a device that is used to capture and remove welding fumes and other airborne contaminants from the air. It works by drawing air through a filter which captures the welding fumes and other airborne contaminants, and then exhausts the clean air back into the environment.
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In a liquid there is a higher solubility of a gas than in a solid.
Lowering the temperature - lowering the temperature will reduce the solubility of the gas in the liquid, and allow it to be released from the liquid, but since welding has to be done at high temperatures, this action may not help. Increasing the pressure may also help to lower the solubility. Performing laser welding - will help to control the speed of the welding and thus it is possible to perform rapid heating and cooling of the area so that the gas vapors will not be enough to form
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Action purpose: Why is the customer doing it? What is he trying to achieve doing it?
Welding of components and connection of metals in order to create different and diverse connections for the various industries, sometimes two or more different types of metals are needed due to different weight or need for the product and it is necessary to connect them. These companies use the welding process to perform this operation.
Action Preventing Action: What should be done to prevent the customer from doing the action?
If the welding is not satisfactory and there are many failures, the customer will not be able to use the welding equipment because it will not give him a satisfactory answer
Customer needs: How can we achieve it?
Performing good and efficient welding without welding failures or bubbles that will weaken the connection will make the customer provide a better and more efficient product and therefore the customer will want this action.
control the speed of the process, thermal gradient, dynamics of melt pool flow and solidification Can help the welding failures. Performing laser welding can help control these details and improve the welding results.
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| Option | Rank |
|---|---|
to control the
speed of the process, thermal gradient, dynamics of melt pool flow and solidification using a laser beam welding | 3 |
to use the right welding method and materials | 2 |
Keep the welding area clean and perform the welding under nitrogen injection in order to prevent oxidation of the area | 1 |
to use the right parameters and
techniques | 0 |
If | We will perform laser welding |
|---|---|
Then | It will be possible to control the speed of the process, thermal gradient, dynamics of melt pool flow and solidification, as a result the Welding performance will be better and with fewer failures |
But | It will be requires local suction control and protections against laser radiation. |
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