Autonopedia

A

Mark off to suit the length of scroll wrench required.

Upset the part forming the top of the T around the mark. Then, using the peen of the hammer, forge a one-sided scarf, keeping the underlip flat on the anvil face like this -

Place it on the edge of the fire to retain the heat.

B

The leg of the T is made by first upsetting one end and then forging a double winged scarf.

C

Next, take a FULL WELDING heat on both pieces together, lay them on the anvil in this position

The first blow should be on the thick back of the top scarf so that it welds to the thin end of the under scarf before this is chilled by the anvil.

Continue by hammering towards the top of the T.

Dress up over the rounded edge of the anvil.

D

Cleft Weld
The alternative method of welding a T is a little more difficult, but results in a much stronger joint.

Start by forging a double-sided scarf on the bar where the leg of the T is to be welded. Hammer on both sides and draw out the lip a little longer than in the other method.

E

Next make a cleft end on the leg of the T by first upsetting and drawing to a blunt chisel end which is split as described in Lesson 31.

F

At a BRIGHT RED heat, set the two pieces together and hammer first on the top of the cleft bar and then on the lips to form a perfect fit.

Take a FULL WELDING heat on both pieces together, lay the long bar on the anvil and start welding by driving the cleft portion over the bottom scarf so that the root of the V of the weld takes first.

G

Take another FULL WELDING heat and weld in the lips of the scarfs.

The completed weld is shown here made into a scroll wrench; the end has been bent as in Lesson 27.