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The mild steel in this AWS standard refers to lowcarbon less than
0.25 carbon steels such as ASTM A 53, A 106, A 135, A 179, A 524, A 587,
and API5L, Grades A25, A and B, and X42. It covers pipe sizes of DN 200
NPS 8 and under, with wall thicknesses of 13 mm 0.5 in. and under. Youll
find Guide for Welding Mild Steel Pipe especially useful for pipingsystem
applications such as lowpressure heating, air conditioning, refrigeration,
water supplies, and some gas and chemical systems. It explains techniques
for procedures such as preheating, joint preparation, alignment and positioning,
fittings, and root and hot passes for SMAW, OAW, GTAW, and GMAW. Tables
include Required Filler Metal per Joint for Mild Steel
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