19–24 May 2024
Music City Center
US/Central timezone

Optimization of a welding procedure for making critical aluminum welds on the LBNF absorber core block

TUPS43
21 May 2024, 16:00
2h
Blues (MCC Exhibit Hall A)

Blues

MCC Exhibit Hall A

Poster Presentation MC4.T20 Targetry and Dumps Tuesday Poster Session

Speaker

Abhishek Deshpande (Fermi National Accelerator Laboratory)

Description

The LBNF Absorber consists of thirteen 6061-T6 aluminum core blocks. The core blocks are water cooled with de-ionized (DI) water which becomes radioactive during beam operations. The cooling water flows through gun-drilled channels in the core blocks. A weld quality optimization was performed to produce National Aeronautical Standard (NAS) 1514 Class I [1] quality welds on the aluminum core blocks. This was not successful in all cases. An existing Gas Tungsten Arc Welding (GTAW) Welding Procedure Specification (WPS) was fine tuned to minimize, in most cases, and eliminate detectable tungsten inclusions in the welds. All the weld coupons, how-ever passed welding inspection as per the piping code: ASME B31.3 Normal Fluid Service [2]. Tungsten electrode diameter, type, and manufacturer were varied. Some of the samples were pre-heated and others were not. It was observed that larger diameter electrodes, 5/32 in., with pre-heated joints resulted in welds with the least number of tungsten inclusions. It is hypothesized that thinner electrodes breakdown easily and get lodged into the weld pool during the welding process. This breakdown is further enhanced by the large temperature differential be-tween the un-preheated sample and the hot electrode.

Funding Agency

Fermi Research Alliance, LLC under Contract No. DE-AC02-07CH11359 with the U.S. Department of Energy, Office of Science, Office of High Energy Physics.

Region represented North America
Paper preparation format Word

Primary author

Abhishek Deshpande (Fermi National Accelerator Laboratory)

Co-authors

Kris Anderson (Fermi National Accelerator Laboratory) Vladimir Sidorov (Fermi National Accelerator Laboratory) james zahurones (Fermi National Accelerator Laboratory)

Presentation materials

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