On the Elimination of Welding Fumes by Ring Hood

概要

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Various local exhaust apparatuses are applied to eliminate the welding fumes for the purpose of improving the environment in welding shops. Nevertheless, these apparatuses don't always function effectively, and it comes into question that the parts to be welded are hurt in the cases of CO_2 gas welding process, on account of the air streams into hoods disturbing the shield gas atmosphere. Therefore, the following is tried to solve the above mentioned problem ; that is, making the hood's opening in ring form would be effective to prevent the disturbance of shield gas atmosphere and to raise the inhaling efficiency of hood. From this point of view in this experimental study, the size of hoods, the distance between base metal and hood's opening and the suction flow rate are varied, and the fundamental exhaust characteristics of hoods are investigated. The results are summarized as follows : (1) Generally speaking, enlarging the size of hood, narrowing the distance between base metal and hood's opening and increasing the suction flow rate improve respectively the inhaling efficiency of hood. (2) Such defects as the creation of blow-hole and the lowering of penetration efficiency are partly observed in cases of comparatively small sizes of hoods.
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