Page 227 - Mechanical Engineer's Data Handbook

MANUFACTURING TECHNOLOGY 215

Positions of welding

In addition to 'flat' welding, which is the ideal position,
three other positions are used: horizontal, vertical and
overhead. If one member is vertical and one horizontal
the position is called horizontal-vertical. In the last
case a number of passes must be made to overcome the
tendency for molten metal to run out. (See figure.)

Horizontal vemcai

Overhead Horizontacvellical

5.12.9 Welding terminology, throat size
and allowable stress

Welding practice

The relevant British Standards are BS 4360: Part 2, BS
%
639, BS 1719, BS 1856, BS 2642, BS 449 and BS 499.

Leg length f Excess weld
Included Weld face
metal
i

Root / Throat thickness

e = included angle
Fillet weld
Butt weM

Effective throat size (r=throat thickness, L=leg length)

Fillet angle, 0 (") 60-90 91-100 101- 106 107-1 13 114-120
tlL 0.7 0.65 0.6 0.55 0.5