Solid-state and fusion resistance spot welding of TD-NiCr sheet

Journal Article · Tue Jan 01 04:00:00 EST 1974 · Weld. J. (N.Y.), v. 53, no. 1, pp. 37s-48s

OSTI ID:4365941

Moore, T J

Four welding schedules were evaluated using convertional resistance welding equipment. Both specially processed (unrecrystallized) and commercial TD- - NiCr sheet (0.4 mm thick) were used. Welding parameters were selected in order to produce both solid state and fusion resistance spot welds. All mechanical tests of the weldments were conducted using a single-spot lap joint specimen after postheating at 1200 deg C for two hours in hydrogen. The feasibtlity of producing solid-state resistance spot welds was also demonstrated in thicker (1.6- mm) TD-- NiCr sheet. Excellent results were obtained using a solid state resistance spot welding schedule and specially processed sheet. After postheating, the weld was indistinguishable from the base metal. In 1100 deg C stressrupture shear tests, the welds were as strong as the base metal. Base metal failure, rather than weld failure, took place in the stress- rupture tests and the other mechanical tests that included room temperature and l100 deg C tensile-shear, andd room-temperature fatigue tests. Less satisfactory results were obtained using commercial sheet. A minimum heat input fusion spot weld could not be made without affecting the microstructure of the sheet. Solid- state spot welds, however, were produced without affecting sheet structure. But, for the solid-state welds, the weld plane was a stable grain boundary. Unsatisfactory results were obtained when a conventional fusion spot weld was made in commercial sheet. Within the nugget the fine thoria dispersion and the large grain structure of the sheet were lost. A valid stress-rupture curve could not be determined for this type of weldment. (21 figures, 5 tables) (auth)

• Research Organization: Lewis Research Center, Cleveland
• NSA Number: NSA-29-016221
• OSTI ID: 4365941
• Journal Information: Weld. J. (N.Y.), v. 53, no. 1, pp. 37s-48s, Journal Name: Weld. J. (N.Y.), v. 53, no. 1, pp. 37s-48s; ISSN WEJUA
• Country of Publication: Country unknown/Code not available
• Language: English

Related Subjects

*TD-NICKEL CHROMIUM-- SPOT WELDING
N50220* --Metals
Ceramics
& Other Materials--Metals & Alloys--Preparation & Fabrication
RESISTANCE WELDING
RUPTURES
SHEETS
TESTING