用1毫米薄板卷制成较细的管,在焊接纵焊缝时,如果采用氧-乙炔焰焊接,变形大生产效率低。于是,我们就采用夹具将接头的缝隙夹严,用ф2～2.5毫米的焊条焊接,选用适中的焊接电流,较短的电弧,焊条做直线运条不横摆,焊速要求匀而快。用这种方法焊接后的小管,变形小,焊缝致密性好,生产效率高。即使管子的个别处焊的不好,也不会发生渗漏。因为在电弧经过时,此处的铁板已发红,达到半熔 With 1 millimeter thin roll made of thin tubes, welding vertical welds, if the use of oxygen - acetylene flame welding, large deformation and low efficiency. So, we use the fixture to clamp the joints tight, with ф2 ~ 2.5 mm welding electrode, the choice of moderate welding current, a short arc, the electrode is not a straight line run, the welding speed uniform and fast. With this method after welding the small tube, small deformation, weld tightness, high production efficiency. Leakage does not occur even if the individual parts of the tube are not well soldered. Because in the arc when the iron plate here has been red, reaching half-melting