为了克服小直径45°固定管TIG打底层因焊接空间位置而影响焊接质量的问题,采取了斜仰焊位置内填丝、向上焊外填丝和向下焊内填丝三种方式相结合的焊接方法。通过大量的实践证明,采用该方式进行焊接,既可以解决在空间位置上左手操作不方便,又可以保证焊接质量,确保管内外余高达到要求和获得良好成形。主要介绍手工钨极氩弧焊小直径45°固定管打底层的焊接方法和焊接工艺。 In order to overcome the problem that the thickness of TIG primer with small diameter of 45 ° fixed pipe affects the welding quality due to the position of welding space, a combination of three methods of wire filling in inclined position, wire filling in upward welding and wire filling in downward welding Welding method. Through a large number of practices, it has been proved that using this method for welding can not only solve the inconvenience of left-handed operation in the spatial position but also ensure the quality of welding and ensure that the inside and outside of the tube meet the requirements and get a good shape. Mainly introduces the welding method and welding process of the bottom layer of small diameter 45 ° fixed tube of manual TIG welding.