プロパン酸素炎による鋼材の溶接について(第 4 報) : 火口の改善

概要

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In order to improve the intensity of propane-oxygen flame two kinds of tips were designed. One was a preheating tip, in which the gas mixture was heated before combustion. The other was an outside injecting tip, which had two oxygen streams and one propane stream issuing concentrically from the tip. The propane stream is injected by the central high speed oxygen stream and mixed at a point outside of the tip. The experimental results are summarized as follows : (1) Certain effect of the preheating tip was recognized and the time to start the melting of plate became shorter than that by usual tip for oxyacetylene flame. It was deduced that the preheating temperature by this tip was about 100℃. (2) Flame cone by the outside injecting tip was a little larger than that by the usual tip, but the outer flame was much smaller. (3) The time to start melting by the outside injecting tip became a half of that by the usual one. (4) The flame by the outside injecting tip had a stronger oxidizing effect on weld metal than one by the usual tip. (5) The welding rod containing 0.2-0.7% aluminum in addition to silicon and manganese was suitable for a propane-oxygen flame welding using this tip.
1968-10-25