Page 226 - Mechanical Engineer's Data Handbook

2 14 MECHANICAL ENGINEER'S DATA HANDBOOK

Recommended welding processes

Manual metal arc R R R R R R S S U N R U
Submerged arc R R R R S S N N U N S U
TIG S S S R S S S R R R R R
MIG S S S R S S N R S R R S
Flash welding R R R R S S N S N S S S
Spot welding R R R R S S U R S S R S
Oxyacetylene weldi ing R R S S S S R S N S S U
Furnace brazing R R S S S N N R N S R S
Torch brazing S S N S S N R R N R R S

R =recommended; S = satisfactory; N = not recommended; U =unsuitable.

Edge preparation

Plates below 8 mm thick may be butt welded without
preparation; with thicker plate the edges must be
chamfered to obtain good penetration. The groove is
then filled by depositing a number of runs of weld. The
double V uses less material for thick plates and also
reduces thermal distortion. A U preparation ap-
proaches a uniform weld width.

Arc weldine: - edge preparation
I
Close butt Single U

Single V Y"'Y
I/---

Double V