Thglimited - Heavy Industries

Direct design of critical high pressure valves for customers in:  Oil & Gas, Petrochemical, Chemical and Power

• Coordinate all projects within the design engineering department
• Basic type valves – On-Off, Check, Regulators,
• High Pressure – Sealing Technology
• Metallurgy and / or Engineered Plastics
• Materials such as: 254 SMO, Hastelloy C, Duplex and Super Duplex
• Understand Manufacturing Technology so can effectively:
• Design for Cost
• DFMA / Design for Manufacturability

To confidentially explore this opportunity, email your resume today to dstad@comcast.net, or call David at 770-391-9181.

Stadnick and Associates, Inc.

Matching great jobs and great people in Valves, Process Controls, and Instrumentation.

For another installment of Scientific Things, our attention is turned again to the Olympics, in which all that glitters is approximately 7.5 percent gold.

Each of the 1,014 podium athletes in Vancouver (615 Olympic, 399 Paralympic) receives a completely individual medal. No two are exactly alike. The 2010 medals are undulating, wavy disks with laser-etched designs of Aboriginal art unique to each medal. In a nod to eco-friendliness, a small percentage of the gold, silver, and copper used in the medals were recovered from discarded electronic circuit boards.

Back to that 7.5 percent gold content: the gold medals awarded at the Games are actually mostly silver, with six grams of gold plating. Silver medals are made from sterling silver, which is composed of 7.5 percent copper and 92.5 percent silver. As for the bronze medals, they are mostly copper. (I wasn’t able to confirm the copper content, but there is usually tin included in the bronze alloy.)

Click on the poster for a high resolution image:

Well, i didn’t say how long post-date, i just said it would be post-.

I’m sitting in the computer lab right now with stacks of books about Birds of the Smokies sort of surrounding me.  I’m trying to scratch up some new inspiration for a couple of paintings i’m working on.. nests and that sort of what-have-you.

Interesting how the Eastern Phoebe (who says, in a husky voice, fee-be) is a bird who has adapted well to man-made structures, and builds it’s nest on window ledges, under bridges and culverts.  I love the Phoebe.  i’m wondering if this was the kind of nest i found in a window the other day.

it looks like it’s made with moss, and i think that’s one of the most beautiful ideas ever.  sigh.  i want a home, preferably made of moss.

I’ve been in the forge this morning working on a metal sculpture, heating and hammering, heating and hammering steel stock,  trying to make a nice curve.   also trying to not drop hot metal on my feet.  also trying to not catch anything on fire, specifically my body.  also trying to impress Olivier, my welding instructor, who i absolutely love.

i’m hoping this piece will help me process how i feel about my new job, which is being the boss of more people than ever, and trying to get them to be aware of their hearts and how they affect other people.. (and also supervising a school).  Which is a really big deal, and i sometimes feel like i’m too young to have this much responsibility.  Though sometimes i feel very, very old.

So far, the metal piece has made me very tired.  The job, too.
BUT also, it’s made me feel:  extremely powerful and pretty much like i’m a badass, capable of nearly anything.
seriously. i’m cutting metal with fire, here.

A highly elastic composite metal foam could one day be a favorable material for biomedical implants and car bumpers.

No, this isn’t a close-up of the surface of a golf ball. It’s a new type of material, one that is porous and elastic, lighter than solid aluminum yet stronger than steel, one that its creators are calling an “ultra high-strength metal matrix composite foam.” A bit of a misnomer, really, considering the foam is made up entirely of stainless steel.

But one particular feature of this metal foam, its modulus of elasticity, is what makes it so lucrative for the biomedical, aerospace and transportation industries. This measure is essentially the relationship between a force applied to an object and the amount of deformation the object experiences as a result of that force; elasticity refers to the object’s ability to bounce back to its original state, undamaged, once the force is removed. Diamonds, for example, have a high modulus of elasticity, while something like a foam stress ball would have a much, much lower one.

The foam is created with a modulus of elasticity very similar to that of natural bone in humans, making it an ideal material for biomedical implants, compared with the modulus of titanium implants, which can be anywhere from 3 to 10 times higher than bone. This is important, the researchers say, because an implant has to function much like a natural bone inside the body, especially when it comes to handling loads. If an implant is too strong, it takes over load-bearing responsibilities and the surrounding bone begins to weaken, which in turn loosens the implant and requires another replacement surgery. The material is also very light due to its porosity, and its rough surface could help natural bone adhere to the implant, further increasing its strength and stability inside the body.

Another advantage of the metal foam, notes the research team from North Carolina State University, is its relative ease to produce. They combine tiny, hollow stainless steel beads with powdered steel in a mold, then put the mold into a hot press, where high pressure and temperature ultimately force the materials to weld themselves together. The end result of this process, a standard one called powder metallurgy, is the composite foam consisting of tiny, uniform pockets of air reinforced by a solid metal matrix. Although the foam is 1/3 the density of solid steel, it can absorb up to 80 times as much energy over the same volume. This is also an improvement over other types of metal foam, where variations in cell size and thickness of the cell walls cause uneven deformation under stress.

Besides biomedical implants, the researchers imagine that the foam could be useful in aerospace or transportation. Putting two cylinders of the foam on a car bumper, for example, would make an impact at nearly 30 mph feel like an impact at only 5 mph.

Their research will be published in the March 2010 issue of Materials Science and Engineering A: “Evaluation of modulus of elasticity of composite metal foams by experimental and numerical techniques”: L. Vendra, Afsaneh Rabiei

Hi Folks,

Just finished this knife for a customer….with an extra long clip on cold blued blade of 1095 edge quenched steel. The blade itself measures 4 5/8″ with an O.A.L. of 10″. The customer supplied the wood…African Rosewood aka Bubinga…it’s beautifully grained with streaks of brown, black, and orange. Nickel silver fittings include a guard, butt cap, pommel nut, an a single 1/16″ lightly domed pin. There is a cold blued mild steel spacer behind the guard to balance out the blade.

Thanks for Looking,

Bob

This piece is sold!

In January, the UCLA/Getty Conservation Program welcomed two visiting students from China.  Yali Yun and Jianxi Li, two doctoral candidates at the University of Science and Technology Beijing, will be conducting research for their dissertations on ancient metals and be working with Dr. David Scott.

Yali Yun

Yali Yun’s research focus is on technical studies of ancient metal in Western Dian (Yunnan) China. She is also interested in researching methods used in Chinese traditional art and crafts.

Jianxi Li

Jianxi is focusing his research on the early metallurgy of central China. He is also interested in ancient Chinese inscriptions and texts which refer to metals and metallurgical practices.

Both Yali and Jianxi will be working with Dr. Scott until June examining and analyzing samples they brought for their dissertation research. They will also be sitting in on conservation classes offered in the winter and spring quarters

Welcome to EHA Engineering’s official blog.

Written by Al Hayden, President of EHA Engineering and Metallurgical Engineer, he will comment on Company, industry and related mining/economic topics 2-3 times per month. 

We would like to take this opportunity to also announce our new capital cost estimating service.  Available online at www.ehaengineering.com. 

Regards,

Al Hayden and EHA Engineering Team.