| 摘要 |
<p>The present invention relates to a pre-heating torch for welding to improve welding quality as air pressure and ethylene are combined well, and pre-heating performed well. As the present invention is the pre-heating torch to pre-heat an object to be welded, the pre-heating torch comprises: a spraying pipe equipped with a plurality of nozzles for a flame to be belched out for pre-heating; and a combination unit connected with an air pressure supply pipe supplying air pressure to an upper portion of a gas injecting pipe formed on a side of the spraying pipe being able to inject pre-heating gas.</p> |
