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Explanation of common terms in welded pipe welding
1. Weld width: the joint between the weld surface and the base metal is called the weld toe, and the distance between the two weld toes is called the weld width.
2. Reinforcement: in the butt weld, the height of the weld metal beyond the connecting line of the weld toe is called reinforcement. There in for cement increases the cross-sectional area and strength of the weld, which can increase the sensitivity of X-ray photography, but it is easy to cause stress concentration at the weld toe. Therefore, there in for cement shall not be lower than the base metal, but it shall not be too high. According to national standards, the residual height of manual arc welding is 0 mm ~ 3 mm, and the residual height of submerged arc welding is 0 mm ~ 4 mm
3. The shape and size of fillet weld can be divided into two types according to the appearance shape of fillet weld: convex fillet weld is called convex fillet weld; The weld foot seam with concave weld is called concave fillet weld. Under certain other conditions, the stress concentration of concave fillet weld is much less than that of convex fillet weld
(1) Calculated weld thickness: draw the largest right angle isosceles triangle on the fillet weld section and the length of the vertical line from the right angle vertex to the bevel. If the cross section of the fillet weld is a standard isosceles right triangle, the calculated thickness of the weld is equal to the weld thickness. In convex or concave fillet welds, the calculated thickness of the weld is less than the weld thickness.
(2) Weld crown: the maximum distance between the weld toe line and the weld surface on the cross section of convex fillet weld.
(3) Weld concavity: the maximum distance between the weld toe line and the weld surface in the section of concave fillet weld.
(4) Weld leg: the minimum distance from the weld toe of one weldment to the surface of another weldment in the fillet weld section
4.Weld forming factor: the smaller the weld forming factor is, the narrower and deeper the weld is, and such welds are prone to pores,slag inclusions and cracks. Therefore, the weld forming factor shall be kept at a certain value. For example, the weld forming factor of submerged arc welding shall be greater than 1.3.
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