我厂在制作一台直径为800mm的容器时,测得椭圆封头尺寸为φ798mm,而筒节实测直径为φ802mm(下图)。封头与筒节组对后,垫板不能紧密贴合,如不采取有效措施,必然会有出现夹渣或未焊透等缺陷的可能。为确保焊接质量,我们采用了以下两种方法: ①测出封头与筒节直径(或周长)的实际差值。并以此为据,首先将垫板紧密贴合到封头上,并进行定位焊。然后敲制出相应尺寸的喇叭口,该喇叭口的口径稍大于其组焊的筒节 Our factory in the production of a container with a diameter of 800mm, the measured oval head size φ798mm, while the measured diameter of the tube section φ802mm (below). After the head and the tube section of the group, the plate can not be close fit, if not take effective measures, there will inevitably occur slag inclusions or incomplete penetration defects. In order to ensure the welding quality, we adopt the following two methods: ① Measure the actual difference between the head and the tube diameter (or perimeter). And based on this, the first close to the pad plate head, and positioning welding. And then knocked out the corresponding size of the bell mouth, the bell mouth slightly larger than the diameter of its welding tube