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Fastening, Joining & Assembly

The Fastening, Joining and Assembly Blog is the place for conversation and discussion about fasteners and hardware, design for assembly, adhesives and sealants, and welding and joining technologies. Here, you'll find everything from application ideas, to news and industry trends, to hot topics and cutting edge innovations.

Self-healing Cement for Well Casings

Posted March 05, 2017 12:00 AM by Engineering360 eNewsletter

Researchers at the U.S. Energy Department's Pacific Northwest National Laboratory developed cement that can heal itself when cracks occur. Using self-healing cement for geothermal wells would save geothermal plants millions of dollars and would reduce the amount of downtime necessary for repairs.


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1 comments; last comment on 03/09/2017
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Easily Assemble Any Material or Fastener

Posted February 16, 2017 12:00 AM by SavvyExacta

Assembling car bodies the "old" way was easy: you just had to weld the steel base to the chassis. With changing materials (lighter weight materials such as aluminum, carbon fiber, etc.), welding is often impossible and riveting requires access to the fastener location from both sides.

Want to gain a solid understanding of how to integrate the ADAPTIVE-DFS into automotive and appliance assemblies, and how it can result in time, labor, and cost savings across the board?

Sign up for a free webinar by DEPRAG.

Key Take-Aways:

  • Learn the fundamentals of automotive and appliance assemblies through the use of DEPRAG's ADAPTIVE-DFS
  • Understand the advantages that result into time-, labor-, and cost-savings
  • Learn what materials and fasteners to use for the most efficient assembly

Webinar Details:

February 22 - Wednesday (also available on-demand for 90 days after the live broadcast)

2:00 PM EDT - 3:00 PM EDT

Webinar Link

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Replacing Cement with Geopolymers May Cut Emissions

Posted January 27, 2017 12:00 AM by Engineering360 eNewsletter

Cement production is responsible for more than 5% of global yearly CO2 release, university researchers say. Substituting geopolymers for cement could lead to reductions in atmospheric carbon dioxide. These materials also may be more resistant than cement to high temperatures and chemicals.


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2 comments; last comment on 01/30/2017
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Source Globally, Build Locally

Posted November 29, 2016 12:00 AM by Engineering360 eNewsletter

If you distribute your printed circuit assemblies worldwide, it would make sense to produce them near your customers. But there may be enough variations at each site to cause problems in the final assembly. A new software tool from Mentor Graphics takes the CAD files and bill of materials from the original designer and converts them into neutral specifications that will ensure product uniformity.


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Standards Q&A: Interpreting ASME’s Post Weld Heat Treatment Requirements

Posted September 25, 2016 12:00 AM by reprendergast
Pathfinder Tags: ASME standards Welding

ASME Standards often require careful reading in order to interpret them correctly and engineers can be left with questions about some details. In this post we take a look at an engineer’s welding question related to a vessel’s heat treatment.

Question: My shop is constructing a Section VIII Division 1 vessel that uses SA-516 Grade 70 Normalized Plate Material. The Vessel is not exempted from Impact Testing. Can I use an existing PQR qualified with SA-516 Grade 70 as rolled plate to support the WPS I want to prepare to weld on this vessel?

Reply: The short answer to the above question is No.

UG-84(h)(2)(-b) says “be in the same heat treated condition” as one of the requirements to be fulfilled for the test plate material used to qualify the PQR with impact testing. Therefore a PQR qualified with SA-516 Grade 70 as rolled plate cannot support a WPS written to weld SA- 516 Grade 70 Normalized Plate Material.

Someone could potentially misinterpret the phrase mentioned above in quotes to be the post weld heat treatment (PWHT) instead of the heat treatment condition of the base material.

Note that Section IX does not list the base metal heat treatment condition as a supplementary essential variable. So this is a perfect example of a construction code invoking a supplementary essential variable in addition to the ones provided in Section IX.

Another subtle point to be noted here is that a PQR qualified in accordance with Section IX rules doesn’t need to show the base metal heat treatment condition in the PQR since it is not a supplementary essential variable in Section IX. However, in order to make the same PQR compliant with Section VIII Division 1 impact testing rules, base metal heat treatment condition needs to be recorded in the PQR either explicitly or by attaching a material test report of the test plate material used to qualify the PQR.

In summary, the absence of verifiable evidence about the base metal heat treatment condition can make the acceptability of an existing PQR meeting Section IX requirements questionable for Section VIII applications.


Editor's Note: This is a sponsored blog post by HSB Global Standards.

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