US976455A - Method of uniting metals. - Google Patents

Description

WITNESSES W. G. GREY & W. GRIFFITH.

METHOD OF UNITING METALS.

APPLICATION FILED FEB.23, 1910.

Patented Nov. 22, 1910.

2 SHEETS-SHEET 1.

INVENTORS TTTTTTTTTTTTTTTTTTTT S.

'APPLIOATi nnnnnnnnnnnnnnnnnn o.

2 SH E EEEEEEEEE 2.

unrrnn STATES Parana? ()FFICE.

WILLIAM Gr. GREY AND WILLIAM GRIFFITH, 0F PITTSBURG, PENNSYLVANIA.

METHOD OF UNITING METALS.

I the harder metal to a cleaning and other preparatory treatment, applymg the softer metal, bringing the two metals to a heat, and then uniting by pressure, as will be hereinafter more fully described.

We will now describe our invention so that others skilled in the art to which it appertains may understand and practice the same, referring to the accompanying draw- .ings in which we have shown our invention applied to the preparation of ingots, billets, or bars. We do not, however, desire to limit ourselves to the preparation of any particular shape. For convenience, however, 1n describing our invention we will hereinafter refer to the iron or steel shape as the harder body of metal.

1 Figure l is a perspective view of an ingot,

billet, or bar of hard metal, having a body of softer metal united thereto, in accordance with our invention; and Figs. 2, 3 and 4 are similar views showing modified forms of shapes to be hereinafter more fully referred to. I

' In carrying out our invention, the body of harder metal 2 is first subjected to a cleaning or preparatory bath to remove thescale and oxid from the surfacevor surfaces to which the softer metal is to be united. This cleaning bath may be the ordinary acid solution used for this purpose. After the above treatment, the body 2 may be given a coating of alkali solution, such as chromate 'potasslum or chromate sodium, so as to prevent'ready oxidation of the surface or surfaces thus cleaned.

' After the body 2 of harder 'metal has received the above treatment, it is placed in a solution of metallic salt, sulfuric acid, and alum. The particular salt which we prefer to use is sulfate of copper. This solution is the metals thus united are heated to a temperature slightly below the fusing point of the softer metal, in which state the two metals are welded by subjecting to suitable pressure device, such as rolls or presses.

The metals having been welded, may then be rolled or otherwise worked as desired.

Any suitable manner of attaching the body of-softcr metal to the'body of harder metal may be employed. In Fig. 1 the body 2 of harder metal is shown as having the recess4 in which is placed the body of softer prepared and proportioned preferably as metal 3, which is to be united thereto in the manner above described. In this construction the edges or flanges 5 formed by this depressed surface serve, when pressed against the edge of the body of softer metal 3 to rigidly hold the body 3 in position on the shape 2.

In Fig. 2 the body of softer metal is shown in the form of a shell or continuous coating 6. It will be seen that the shell 6 may be readily placed in position on the bar 2 preparatory to being united therewith. A further form or shape of the body 2 of harder metal is shown in Figs. 3 and 4. Fig. 3

shows the body of softer metal in the form of the core 7 while inthe latter, Fig. 4, is

shown both a core 7 and an outside shell or coating 6. These latter shapes, that is, the shapes shown'in Figs. 2, 3 and 4, are suchas may be employed in the production of wire rods and the like.

The advantages of our invention will be a preciated by those skilled in the art. The addition of the, alum to the solution of metallic salt conduces to a rapid incremental homogeneous deposit of the copper on the body adapted to receive it;this homogene ousness of the coatin resulting in a perfect union of the meta s when subsequently united in the manner above described,

Having thus described our invention,

What we claim and desire to secure by Letters Patent is:

1. The herein-described method of uniting relativel hard metals, such as iron or steel with re atively soft metals such as copper, brass, bronze, aluminum or other metal or alloy; w ich .consistsjn first cleaning the harder metal, subjecting it to a solution-of metallic'salt and alum; a plying the softer metal to the treated su'r ace of the harder metal, bringing he metals to a heat, and then uniting by ressure.

2. The hereinescribed method of uniting relatively hard metals,- such as iron or steel with relatively soft metals such as copper,

brass, bronze, aluminum, or other' metal or alloy, which consists in "first cleamng the harder metal, applying to its surface a coating of alkali solution, subjecting it to a solution of metallic salt and alum, applying the 20 M. ARTHUR KELLER, MARY A. BARTH.

Images