Experimental techniques. Part 1 C-Mn weld metals: Manganese and carbon; Effects of welding process variables; Effects of heat treatment; Silicon and impurities; Nitrogen and strain ageing. Part 2 Low alloy steel weld metals: Single additions: With varying manganese; Elements in combination – Cr-Mo. Part 3 High purity weld metal: Titanium; Combinations with oxygen; Combinations with nitrogen. Part 4 Microalloying of C-Mn steel weld metals: Single microaolloying elements (with and without titanium); Combinations of microalloying elements. Part 5 Microalloying of high purity low alloy steel weld metals: Titaniumm and single additions of Cr, Mo, Ni and Cu; Titanium and multiple alloying elements: Mn-Ni-Mo weld metals. Part 6 Metallography: Metallographic features.