Metallurgy is the study of metal. Welding Metallurgy is the study of how welding affects the microstructure of the metal.
Did you know that there are metallurgists who dedicate their lives to just study the carbon steel? So what about all the other metals such as stainless steel, nickel alloys, aluminum, magnesium, titanium, cobalt, and copper alloy?
Metallurgy is a subject of deep and mysterious that it takes a lifetime to really understand the carbon steel is much less all the rest.
So if it is a deep subject, what is the chance that welders have sufficient understanding of metallurgy to become a better welder.
There is good news. And is not that I save a lot of money on my car insurance by switching to GEICO.
The good news is that you do not have to know anything about metallurgy. You just need to understand some basic principles.
It is absolutely essential to understand is that the heat of the weld metal influence. It sounds very simple but profound. Why? Because heat affects different metals in different ways.
When you heat a piece of metal becomes red hot, and then satisfy by dipping in a bucket of cold water, what do you think happened? If you answered "harden" your only partially right. Only a few metal hardened by heating and rapid cooling. Most other metals react totally different.
Carbon and low alloy steel such as 4130, tool steel, cast iron, and some 400 series stainless steels hardened by rapid cooling of the red hot temperatures.
But most other stainless steels, nickel alloys, aluminum, magnesium, titanium, cobalt, and copper alloys will actually soften and lose their heat by heating and rapid cooling of the red.
So what does this mean to your welder?
If you do the welding on the 4130 chromoly, you need to know not to speed up or cool the weld will harden.
If you are welding 6061 t6 aluminum, you need to know that the weld area will soften if it gets too hot for too long, and the power will be lost and never come back unless the full heat treatment can be done.
Welding 301 full hard stainless steel is easy to do, but the heat from the weld microstructure recrystallizes hard work and strength and hardness goes right out the window.
304 welding of carbon steel and chromium can lead to bind and form a chromium carbide weld area if it is too hot for too long.
So you get the picture. The heat affects different metals in different ways.
Did you know that there are metallurgists who dedicate their lives to just study the carbon steel? So what about all the other metals such as stainless steel, nickel alloys, aluminum, magnesium, titanium, cobalt, and copper alloy?
Metallurgy is a subject of deep and mysterious that it takes a lifetime to really understand the carbon steel is much less all the rest.
So if it is a deep subject, what is the chance that welders have sufficient understanding of metallurgy to become a better welder.
There is good news. And is not that I save a lot of money on my car insurance by switching to GEICO.
The good news is that you do not have to know anything about metallurgy. You just need to understand some basic principles.
It is absolutely essential to understand is that the heat of the weld metal influence. It sounds very simple but profound. Why? Because heat affects different metals in different ways.
When you heat a piece of metal becomes red hot, and then satisfy by dipping in a bucket of cold water, what do you think happened? If you answered "harden" your only partially right. Only a few metal hardened by heating and rapid cooling. Most other metals react totally different.
Carbon and low alloy steel such as 4130, tool steel, cast iron, and some 400 series stainless steels hardened by rapid cooling of the red hot temperatures.
But most other stainless steels, nickel alloys, aluminum, magnesium, titanium, cobalt, and copper alloys will actually soften and lose their heat by heating and rapid cooling of the red.
So what does this mean to your welder?
If you do the welding on the 4130 chromoly, you need to know not to speed up or cool the weld will harden.
If you are welding 6061 t6 aluminum, you need to know that the weld area will soften if it gets too hot for too long, and the power will be lost and never come back unless the full heat treatment can be done.
Welding 301 full hard stainless steel is easy to do, but the heat from the weld microstructure recrystallizes hard work and strength and hardness goes right out the window.
304 welding of carbon steel and chromium can lead to bind and form a chromium carbide weld area if it is too hot for too long.
So you get the picture. The heat affects different metals in different ways.
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