Spot, seam, projection and flash butt welding processes have been successfully applied for welding wrought iron parts. Wrought iron is a soft metal therefore the pressure applied for welding should be just sufficient to produce a sound union.
(c) Oxyacetylene Welding
The technique to weld wrought iron by oxyacetylene method is similar to that followed in welding low carbon steel of the same thickness. However, slag melts earlier than the iron base metal and imparts a kind of greasy look to the base metal which with other ferrous welding metals generally implies that the welding temperature, has reached. The temperature at this stage actually is between 1150 and 1200°C, which is not high enough to fuse the parent metal.
The welder, therefore, should not get confused with the greasy look, but continue heating until locally the iron reaches the state of fusion; otherwise the welds made will be poor and weak. For welding wrought iron, a very low carbon material filler rod and neutral flame are used. Too much agitation of the molten metal during welding should be avoided as it causes the formation of oxides that can be entrapped in the weld.
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