Forge Work

by William L. Ilgen

Fig. 58.—Steps in Scarfing for a Corner Weld.

Upset one end of the other piece to the same dimensions, allowing this upsetting to continue along the metal about 1 inch. Form a scarf on the left edge at e, with the ball of hammer, using blows similar to those shown at c and leaving the end square. Place them together to see if the points meet the heels; if not, make necessary alterations so they will.

Place the pieces in the fire, so that the side scarf will be removed with the left hand and the end scarf with the right. When placing for welding, the right-hand piece should be laid on the anvil and the left-hand one placed in its proper position on top of it. The inside corner should form a quarter-round fillet, the outside should be sharp and square, and the longer end cut off to make them both equal. Smooth all surfaces with a flatter. Sketch F shows the weld completed; the dotted lines indicate the location of the scarfs before welding.

79. T Weld.—[Fig. 59]. Scarfing and welding. Material required: two pieces of ³⁄₄ × ³⁄₈-inch iron, 8 and 4¹⁄₂ inches long.

Fig. 59.—Steps in Scarfing for a T Weld.

Upset one end of the shorter piece ¹⁄₈ inch larger than its diameters, and form a scarf similar to the first one for the right-angled weld, but here allow it to form fan-shaped and project equally over each edge, as shown at a.

Upset the center of the long piece to ¹⁄₈ inch or more larger than its diameters, with the upset portion fully 1 inch long, as at b. Form a scarf at this place with the ball of the hammer, allowing the metal to bend edgewise, as at c. Do not make this scarf quite so wide as the first one, as its edges should be entirely covered by scarf a without leaving any openings. See that they fit properly before heating for welding.

Especial care should be taken to have a good fire. The long piece should be placed in the fire so as to be removed with the left hand, and the short one with the right. Place the short piece on the anvil, with the long piece, held in the left hand, on top of and overlapping it sufficiently to prevent any openings. When welded, the long piece should be perfectly straight, with the short one at a right angle to it. Finish the weld with the flatter while it is at a dull red heat. Sketch D shows the T completed.