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Bob Capudean
Back Alley Customs
- From The Welder
Metallurgy Matters: Thermal cycles, the HAZ, and the strength of martensite
- By Bob Capudean
- Jan 18, 2016
- Metals/Materials
- Article
Last time we looked at how welding heat influences the heat-affected zone (HAZ) of metals strengthened by three typical hardening processes: solid-solution hardening, cold working, and precipitation hardening. That leaves one critical strengthening process to consider: transformation (martensite)...
- From The Welder
Metallurgy Matters: Influencing weld strength
- By Bob Capudean
- Apr 24, 2015
- Metals/Materials
- Article
Weld metal strength: It’s a subject that’s often discussed, and just as often misunderstood. To fully consider how strong weld metal will be or how you can strengthen it, you have to think about not only the preweld decisions that influence weld strength, but also the postweld reactions and...
- From The Welder
Metallurgy Matters: Reactions speak louder than words
- By Bob Capudean
- Apr 6, 2015
- Metals/Materials
- Article
Before we get into nonferrous gas-metal reactions, let’s look at one of the ways you can identify potential cold-cracking problems in steel. In the May/June 2004 issue, we looked at cold cracking—also known as hydrogen cracking, delayed cracking, and under-bead cracking—as it relates to...
- From The Welder
Metallurgy Matters: From one extreme to the other
- By Bob Capudean
- Mar 19, 2015
- Metals/Materials
- Article
In terms of temperatures, the heat-affected zone (HAZ) has it all—from near liquidus to near ambient and everything in between—a fact that makes the HAZ a tricky piece of real estate to understand the predict. Why? Remember, a number of metallurgical changes can take place in hot metal, and...
- From The Welder
Metallurgy Matters: Unlike oil and water, gas and metal can really mix it up
- By Bob Capudean
- Mar 17, 2015
- Metals/Materials
- Article
Gas-metal reactions take place every time you weld. They happen quickly, especially at temperatures above 3,000 degrees F, and can cause serious problems. Of course, not all gas-metal reactions are bad; some are designed in, while others simply take place with no ill effects. But some prove quite...
- From The Welder
Metallurgy Matters: Solidification—It’s more than meets the eye
- By Bob Capudean
- Mar 16, 2015
- Metals/Materials
- Article
There’s a lot going on as your weld puddle solidifies. Grains are trying to grow in a variety of directions, and the entire process can get quite competitive, because some grains grow faster and block the growth of others. Which grains grow faster depends on their orientation at the point where...
- From The Welder
Metallurgy Matters: The tricky subject of weldability
- By Bob Capudean
- Mar 9, 2015
- Metals/Materials
- Article
Welding metallurgy is a science, but it’s far from perfect. I mention this here because my January/February column elicited a number of critical, if not scathing, e-mails concerning everything from a typo in Figure 3 to my generalizing the precise and exacting science of metallurgy. The...
- From The Welder
Metallurgy Matters: Welding’s effect on strengthened steel
- By Bob Capudean
- Mar 9, 2015
- Metals/Materials
- Article
As I mentioned in the September/October issue, welding can severely influence strengthened or hardened metals, depending on the hardening technique used. Hardening Techniques and Welding Effects Work- or strain-hardened metals exposed to the intense localized head of welding tend to recrystallize...
- From The Welder
Metallurgy Matters: The science of welding metallurgy
- By Bob Capudean
- Mar 9, 2015
- Metals/Materials
- Article
It’s time to narrow our focus and look at the science of welding metallurgy, a branch of metallurgy that addresses the behavior of a metal during welding and, just as important, the effects of welding on a metal’s properties. Think about what happens when you weld together two pieces of...
- From The Welder
Metallurgy Matters: Making steels stronger
- By Bob Capudean
- Oct 9, 2003
- Metals/Materials
- Article
When it comes to modifying a steel's strength and hardness, it's important to not confuse hardness with hardenability and remember that hardenability characteristics are important because they help identify how much a specific steel will harden during welding.
- From The Welder
Carbon metal content, Classification of Steel and Alloy Steels
- By Bob Capudean
- Aug 28, 2003
- Metals/Materials
- Article
Classification of steel is important in understanding what types of steel to use. Learn about carbon metals and alloy steels and the steel classification system.
- From The Welder
Metallurgy Matters: Phases, structures, and the influences of temperature
- By Bob Capudean
- Jun 26, 2003
- Metals/Materials
- Article
When you heat or cool a piece of metal to a specific temperature, that metal goes through what's called a phase change, in which its crystal structure changes. Sometimes the change is obvious. For example, when a piece of metal melts, it goes through a phase change when the crystal structure breaks down and the metal goes from solid to liquid. When it solidifies it's also a phase change, as the structure re-forms from liquid to solid.
- From The Welder
Metallurgy Matters: The structure of metal
- By Bob Capudean
- Apr 24, 2003
- Metals/Materials
- Article
The structure of metal is complicated. Metal atoms have no real orderly, defined pattern. Learn about the crystal structure of metals and steel atomic structure.
- From The Welder
Metallurgy Matters: It's all about why
- By Bob Capudean
- Feb 27, 2003
- Metals/Materials
- Article
Talk about a can of worms ... From crystalline structures to phase diagrams and interstitial solutions, from microstructures to allotropic transformations, it sometimes seems that for every question metallurgy can answer, for every problem it can solve, it creates two more.
- Podcasting
- Podcast:
- The Fabricator Podcast
- Published:
- 03/26/2024
- Running Time:
- 67:51
This week on The Fabricator Podcast, Jason Becker, host of the Arc Junkies Podcast and owner of Underground...
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