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Choose the suitable electrode and filler material

Ensure proper cleaning of the base metal and prevent pollutants from entering the welding area.

Optimize the welding process and speed to ensure gas escape.&nbsp;

Controlling the intensity and speed of welding

Aluminum is common material used in the welding industry due to its suitable properties, Although aluminum welding generally has disadvantages. One of these weaknesses is the formation of porosity, which will affect the welded joint's mechanical properties. porosity is formed due to two mechanisms, shrinkage porosity caused by shrinkage during the metal solidification process and gas porosity caused by air trapping and undissolved hydrogen. The welding process often produces gases such as hydrogen, carbon dioxide and steam. During welding, the metal goes into a liquid state and then cools at a rapid rate. because In a liquid there is a higher solubility of a gas than in a solid, This may trap gases inside the material and create bubbles when the welding takes place. n order to minimize the problems with the porosity of the material due to welding, it is necessary to control the speed of the process, thermal gradient, dynamics of melt pool flow and solidification. Therefore, in order to solve this problem, we use laser beam welding.

Finding a solution to the bubbles that are created during welding in Aluminum.

sahar gordo levin
shaked cohen farjon

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Finding a solution to the bubbles that are created during welding in Aluminum.

sahar gordo levin
shaked cohen farjon

The velocity or speed of an object or the rate of any kind of process or action.  The speed may be relative or absolute, linear or rotational.

Speed

As soon as the welding speed can be controlled and fast welding can be performed, it is possible to prevent
the shooting of gas bubbles inside the material.

Asymmetry

Preliminary action

Mechanics substitution

Discarding and recovering

System' Complexity – The number and diversity of elements and element interrelationships within and across the boundaries of a system.  The user may be an element of the system that increases the complexity.  Includes issues like the number of functions, number of interfaces and connections, excessive number of components.    'Control' Complexity – complexity of the control system – either physical components or the algorithms that it contains- used to control a system in delivering useful functions.

Device complexity

Laser technology has been developing a lot in recent years, but there are still difficulties in using this method.
The welding machines are large and a fiber optic cabinet and cooling chiller are needed. In addition, due to the
laser radiation and the wavelength, which may damage vision or cause a burn (depending on the process and
the desired welding), appropriate protective measures are necessary, such as suitable laser glasses according
to the wavelength of the laser, and additional protection such as beam blockers and a suitable position for
laser use.

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In a liquid there is a higher solubility of a gas than in a solid.

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.

Shrinkage during the process of solidification of the metal and trapping of air and undissolved hydrogen

After welding, porosity is created in the welding area - lots of bubbles which weaken the material and cause weak welding, cracks and corrosion.

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

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.

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

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.

High arc currents cause the interaction effect of laser arc and melt flow so that bubbles come out of the molten pool and reduce porosity

A suitable torch position, optimal welding conditions, and a suitable welding range can also control porosity

control the speed of the process, thermal gradient, dynamics of melt pool flow and solidification to ensure gas escape.

Configure the gas flow meter to the correct flow settings. Depending on the welding technique, the gas flow should be between 22 to 30 cubic feet per

controlled hydrogen content, air flow velocity, and room temperature

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.

Finding a solution to the bubbles that are created during welding in Aluminum. sahar gordo levin shaked cohen farjon

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