Imperial welding and cutting hand book; oxy-acetylene, oxy-hydrogen, carbon burning .. by Imperial Brass Manufacturing Company Chicago

Author:Imperial Brass Manufacturing Company, Chicago
Language: eng
Format: epub, pdf
Tags: Welding, Metal cutting
Publisher: Chicago, The Imperial Brass Mfg. Co.
Published: 1916-03-25T05:00:00+00:00

THE IMPERIAL BRASS MFG. CO.

stirring the molten iron with the rod and if the metal is very dirty, by pulling it out of the line of welding by means of the rod.

PLATE 22

Do not move away from the section being worked upon until the weld on that section is complete, as is shown in Plate 22. Never reweld without first grinding out the old material. Don't bring the cone in direct contact with the metal—hold it just a little distance away.

As we progress with the welding, we note that the metal always does not flow where we want it to; i. e., where we are holding the flame. The force of the flame usually prevents this and we add the metal from the welding rod at a point a little distance away from where we actually want it to flow, and when we are ready to have it join the casting, we remove the flame from that point and swing the metal to the section desired by the circular motion described.

Cast iron does not immediately solidify the moment the flame is removed—it remains liquid for some little time and this condition presents two difficulties; one the danger of allowing this fluid metal to flow over, without bonding to other metal, and the other the collapsing of the weld. The first difficulty may be offset by watching the weld carefully and bringing all parts into fusion. The second one is usually experienced by beginners and is caused by their lack of knowledge of the metal and the force of the flame with the metal in a liquid condition is sufficient to cause the metal to collapse and create a hole. When we get this condition, it is sometimes discouraging, as our efforts to fill up the hole usually result in making it larger.

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