A Study on the Wind Resistance in a Gas Shielded Arc Welding (Part 1):The Velocity Distribution and the Characteristics of Jet of the Test Nozzle
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概要
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Nowadays a gas shielded arc welding, i.e.a semi-automatic welding, has been popularized in the metal work industry, but it has a disadvantage with respest to the wind resistance. Under windy condition the growth of defects, for example blow hole and crack, cannot be avoided.<BR>In order to eliminate this disadvantage of gas shiedled arc welding, research of the welding nozzle was planned and 3 types of welding nozzles, i.e.A, B and C types, were trial-manufactured.<BR>A shows an axial single-shielded nozzle, B an axial dual-shielded nozzle with inner and outer flows and C a wirling vortex shielded nozzle with axial and tangential flows.<BR>Experiments were carried out on the distribution ofshielding gas (CO<SUB>2</SUB>) velocity, the shape of gas jets and influence of gas flows on welds. Results of the experiments are summarizedas follows:<BR>(1) The distribution of the gas velocity in A type nozzel is indicated in a convergent solid pattern and B type bozzle is indicated in a semi-redial pattern. In the latter, the inner flow being a little and the outer flow much, the so-called "saddle type" distribution can certainly be gained.<BR>(2) On the shape of gas jet, it is observed that C type nozzle may have all patterns from a convergent solid to a complete radial pattern and this type is estimated to be better for practital welding under windy condition than the other nozzles used.<BR>(3) With A type nozzle we have no defects in the welds in the region of gas flow of 70 or 80 1/min concerning the spattering, the shape of bead and the air inclusion.
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