USRE12953E - Process of welding metals - Google Patents

Description

H. GOLDSCHMIDT. PROCESS OF WELDING METALS. APPLICATION FILED Mu 7,1906.

- Reissued May 4, 1909..

wi tuaoo co UNITEI) ST m: 5 PA HANS GULDSLllMlD'l, ()l" lISSllN-UN-THE liUl'llt, GERMAN), ASSIGNOR, BY MESNE ASSIGN- MENTS, TO GOLDSLIHMIDL 'IIUCRHITCDMPAN Y, OF NEW YORK, N. Y A CORPORATION OF New YORK.

PROCESS OF WELDING METALS.

Specification of Reissuerl Letters Patent.

Reissued May 4, 1909.

Original No. 735,244, dated August 4, 1908, Serial No. 724,708. Application for reissue filed May 7, 1906.

Serial No.

To all whom it may concern:

Be it known that I, lIA-Ns (,iOLUStHDHDT, a subject of the King of Prussia, (lei-man Em- )eror, and a resident of Essen-on-tlie-lluhr, in the Province of the Rhine, German Empire, have invented a new and useful Process of \Velding Metals, of which the following is an exact specification.

M invention relates to a process of metal welding by casting molten material, n'c'lerably molten metal resulting from the reaction due to igniting a mixture of a metallic compound and aluminium, into union with a metallic part. Its chief use is in welding metal pieces by casting molten metal around the ends to be, welded: r

In the processes hitherto used it was al ways a great disadvantage, for some kinds of work, that the metal cast around the ends to be welded joined with, that is, fused, the metal pieces. This disadvantage "For such kinds of work is done away with by the present invention, which consists in first coating the parts to be joined with molten alumina or the like slag. By this coating the molten metal is prevented from coming in contact with and adhering to the parts to be welded.

In order to carry the process into etlect, a sand, clay, or the like .mold is provided around the parts to be joined, wherealter at first molten slag is east upon the parts to be joined, which slug commils around these parts and the heat. rontained in the molten slug is transferred to' these metal pieces. l After a coating; of slop; is formed n round the metal pieces the molten metal is cast into the mold, which metal, on account ol its being an excellent. hent-conductor, transfers its out ire heat to the pieces to be welded, so that in case'the joining faces are pressed together with a sullicicnt -pn-ssure a welding of the some takes place.

In the accompanying drawings l'olinring part 01' this specification, Figure l is a verticul section of the mold and the crucible during the coating ol" the metal pieces with slag. Fig. 2 is a vertical section of the mold and the crucible during the casting oi the metal." Fig. 3 is a longitudi'nal section of the mold with the metal pieces to be welded situated within the same.

and form a layer over the metal a.

as and for the purpose set In order to carry my process into effect, a crucible is filled with a mixture of iron oxid and aluminium metal, both in pulverized form. Afterward this mixture is ignited, so that a chemicalreaction takes place, the resulting product of which reaction consists in molten Iron and alumina.

In the drawings, i. represents the iron pieces to be welded.

I) is a crucible.

c is a mold in which the metal pieces are,

situated.

As the wcilic weight of the alumina is less than the specific weight of the molten iron, the alumina :1 will always float above After the reaction is finished the contents of the crucible I) is cast upon the pieces ato be welded. The alumina d, floating above, will at first come in contact with these pieces and form a protective coverf around the same, so that. the molten iron (4 cannot come directly in contact with the same and. cannot join with these pieces. The latter mode of carrying the process into effect is especiallyadvantageous, us the resulting products of the reaction are in a highly overheated state, so that the welding of the pieces takes, place in a very short time It will be understood that before casting the molten slag; and the molten metal around the pieces to be welded these pieces must be pressed together by means of suitable deviecs or the pieces are held firmlv in their position by means ol clamps or the like, in which. case the pressing together is effected by the inolcrulnr expansion of the pier-res aused by the heating of the same.

liming thus lully described the nature of my said invention, what I desire to secure by Letters "Patentol' the United States is l. A. 'n'occss for welding, metals, consisting in (:ustin}: molten slag around the meeting; faces of the pieces to be welded together, filo and alter the molten slag has formed a protecting coating around the same, casting molten metal around the )rotecting-eovcr,

iorth.

2. A process for welding metal pieces, conloo sisting in filling a crucible with a mixture of iron oxid and aluminium, igniting the n X- the reaction taking place around the part to to be joined. 10 be welded, substantially as set forth. In witness whereof I have hereunto set 3. A process of welding metals, which conmy hand in presence of two witnesses. 5 sists in igniting a mixture of metallic com- HANS GOLDSCHMIDT p ounr and aluminium out of contact with i \Vitnesses: the parts tobe welded, and casting molten WOLDEMAR- I'IAUPT,

material resulting from the reaction into HENRY HASPER.

ture and casting the resulting products of union with the surfaces of two metallic perts

Images