Why Use Alloy 4047 for Hermetically Sealed Housing Covers

In summary, the conversation discusses the use of 4047 Aluminum for housing covers, which are sealed using a laser welding process. The reason for choosing this specific alloy is not clear, but it is noted that it contains silicon which may improve filling properties and reduce burn-through. It is also mentioned that Al-Si alloys have a lower melting point and are used for soldering rather than brazing. The presence of silicon in 4047 Aluminum allows for the housing and cover to be fused together without melting the base material.
  • #1
dingpud
199
1
OK, 4047 Aluminum is used for housing covers which are hermetically sealed using a laser welding process. Can anyone give me a reason why this specific alloy is used?

Some spec on the alloy:
http://www.jlanthonyandcompany.com/product/4047_aluminum.html

I would figure if you had a housing that was 6061 which is typical, you would want to weld the same alloy to it, but apparently not. Any ideas would be helpful.

Thanks,
:tongue:
 
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  • #2
I am not sure exactly why in your application. But I do know that silicon is also used in aluminum Mig wire. I think it improves the filling properties.
 
  • #3
Interesting. Maybe the 4047, typically being found as thin pieces of stock resists burn through...

Who knows...probably someone trying to sell the stuff mentioned about how it "needed" to be used for housing covers, and that's been the industries rule of thumb ever since.:rolleyes:

Thx.
 
  • #4
Al-Si alloys have a lower melting point. Using Al-Si as a filling alloy avoids to melt the base material, so it deforms less. It's more soldering than brazing then.

Was this your question?
 
  • #5
Maybe, so the 4047 contains Si in it's chemical composition, whereas something like 6061 doesn't... This allows the housing 6061 to stay, for the most part, in tact, while the cover 4047 is fused into the housing...

Yeah, if the above statement is true, then yes, that answered the question.

Thanks.
 

1. What is Alloy 4047 and why is it used for hermetically sealed housing covers?

Alloy 4047 is a type of aluminum alloy that is commonly used in hermetically sealed housing covers due to its high strength, corrosion resistance, and low thermal expansion. It is also known for its ability to form a strong bond with other metals, making it an ideal choice for sealing purposes.

2. What are the benefits of using Alloy 4047 for hermetically sealed housing covers?

Using Alloy 4047 for hermetically sealed housing covers offers several benefits, including its high thermal conductivity, which allows for efficient heat dissipation, and its low melting point, which makes it easy to work with during the sealing process. It also has excellent resistance to moisture and other environmental factors, ensuring the longevity and durability of the housing cover.

3. How does Alloy 4047 compare to other materials commonly used for hermetically sealed housing covers?

Compared to other materials, Alloy 4047 offers superior strength and durability, as well as excellent corrosion resistance and thermal conductivity. It also has a lower melting point and is easier to work with, making it a practical choice for hermetically sealed housing covers.

4. Can Alloy 4047 be used in various industries for hermetically sealed housing covers?

Yes, Alloy 4047 is a versatile material that can be used in a wide range of industries, including electronics, aerospace, and automotive. Its unique properties make it suitable for different applications that require hermetically sealed housing covers.

5. Are there any precautions to consider when using Alloy 4047 for hermetically sealed housing covers?

While Alloy 4047 is a reliable and durable material, it is important to take proper precautions when working with it, such as using proper ventilation and protective gear to avoid inhalation of fumes and skin irritation. It is also crucial to follow recommended procedures for melting and handling the alloy to ensure safety and effectiveness.

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