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Патент USA US2122185

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'Patented June 28, 1938
Albert A. Smith, Jr., Metuchen, N. J” assignor to
American smelting and Re?ning Company,
New York, N. Y., a corporation of New Jersey
No Drawing. Application March 20, 1937,
Serial No. 132,093
3 Claims. (Cl. 113-112)
This invention relates to the art of uniting ar
forms, e. g., as powder, and in manners other
ticles or surfaces of lead and lead alloys by burn-i ‘than that above described.
ing or welding processes.
The advantages accompanying the use of the
Among other features, the invention provides invention are well illustrated from the results
5 an improved burning rod and an operating pro
obtained in welding a lead alloy containing 0.32%
cedure which, though applicable to the joining tin, 0.043% calcium and 0.029% magnesium. Us
of lead and lead alloy surfaces generally, is of ing the sodium acetate ?ux, the specimens al
especial importance when used in conjunction ways broke outside of the welded joint when test
with those alloys that are particularly difficult ed for tensile strength, the specimens showing a
10 vto unite.
reduction of area of 100% at the fracture and
In the manufacture of storage batteries, .for the metal being pulled down to a knife edge at
example, it has been customary to unite the grids the break. Welds effected on the same alloy
to the terminals by a burning or welding opera
without the sodium acetate ?ux always broke at
tion and when thelgrids are of antimonial lead, the joint and examination disclosed only a par
15 it is effected with little di?iculty. With some tial union of the surfaces.
While certain speci?c disclosures have been‘
of the improved alloys, however, considerable
diiiiculty is experienced in uniting the grids and made for purposes of illustration, the invention .
terminals although the alloys are otherwise far is not limited thereto. Thus,vit may be used to '
unite surfaces of other lead alloys such as binary
superior to antimonial lead.
20_ ' Alkaline earth-lead alloys, with or without alloys of lead and calcium, alkali metal-lead al 20
loys, etc. In general, it may be said to be appli
other alloying constituents, are examples of im
proved alloys that present a problem in integra
cable to lead and the various lead alloys as are
tion caused, apparently, by the formation of ox ' used for the production of battery grids, cable
sheathing and other lead products. '
idic products on the surfaces being Joined there
What is claimed is:
25' by preventing a clean metal to metal contact.
‘ It has now been found that surfaces or articles
1.,The process for uniting lead or lead alloy
of such alloys can be readily and successfully surfaces which comprises welding same in the
united through the use of sodium acetate as a
?ux. In fact, tensile strength tests show that
30 the weld produced when using sodium acetate is
presence of a sodium acetate flux.
2. The process of uniting surfaces of lead and
lead alloys suitable for battery grids or cable
every bit as strong as the unwelded material.
‘sheaths, which comprises applying sodium ace
tate' thereto as ?ux during welding.
The ?ux may be applied in various man
ners, a successful one being to coat a burning rod
3. The steps in the manufacture of- storage
of desired composition with a water solution of batteries, which comprise producing the electrode
35 sodium acetate and subsequently drying same grids from a suitable lead-alkaline earth metal 35
thereby providing a fairly uniform coating of alloy, and welding the grids to the battery termi
sodium acetate on the rod. As sodium acetate nal posts in the presence of a flux consisting of
melts at a temperature Just below the melting sodium acetate.
point of lead, the ?ux ?ows readily as the bum
40 ing rod melts. The ?ux may be applied in ‘other
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