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2. Welder certification - Wikipedia

   en.wikipedia.org/wiki/Welder_certification

   Welder certification is based on specially designed tests to determine a welder's skill and ability to deposit sound weld metal. The main part of the welder's test consists of welding one or more test coupons which are then examined using non-destructive and destructive methods.

3. Per diem - Wikipedia

   en.wikipedia.org/wiki/Per_diem

   Per diem (Latin for "per day" or "for each day") or daily allowance is a specific amount of money that an organization gives an individual, typically an employee, per day to cover living expenses when travelling on the employer's business. A per diem payment can cover part or all of the expenses incurred. For example, it may include an ...

4. Groton, Connecticut - Wikipedia

   en.wikipedia.org/wiki/Groton,_Connecticut

   Groton (/ ˈ ɡ r ɒ t ə n / GRAH-tən) is a town in New London County, Connecticut, United States, located on the Thames River.It is the home of General Dynamics Electric Boat, which is the major contractor for submarine work for the United States Navy.

5. General Dynamics Electric Boat - Wikipedia

   en.wikipedia.org/wiki/General_Dynamics_Electric_Boat

   Museum ship at Groton, Connecticut on 27 June 1976 [16] Dace: SS-247 23 July 1943 [15] Converted to GUPPY IB and transferred to Italy, [15] 31 January 1955 [16] Dorado: SS-248 28 August 1943 [15] Sunk, off Panama on 12 October 1943 [16] Flasher: SS-249 25 September 1943 [15] Sold for scrap 8 June 1963, conning tower is a memorial at Groton ...

6. Arc welding - Wikipedia

   en.wikipedia.org/wiki/Arc_welding

   Arc welding power supplies can deliver either direct (DC) or alternating (AC) current to the work, while consumable or non-consumable electrodes are used. The welding area is usually protected by some type of shielding gas (e.g. an inert gas), vapor, or slag. Arc welding processes may be manual, semi-automatic, or fully automated.

7. Submerged arc welding - Wikipedia

   en.wikipedia.org/wiki/Submerged_arc_welding

   A submerged arc welder used for training Close-up view of the control panel A schematic of submerged arc welding Pieces of slag from submerged arc welding exhibiting glassy surface due to silica (SiO 2). Submerged arc welding (SAW) is a common arc welding process. The first SAW patent was taken out in 1935.