The Geometry of the Weld

The main geometric parameters of butt weld :

main geometric parameters of butt weld

• S - thickness of the weld metal;
• E - the width of the weld;
• q - bulge butt weld (height gain) - maximum height (depth) between the surface of the weld location and level the surface of the welded parts;
• H - depth of penetration (depth of penetration) - the maximum depth of melting of base metal;
• t - thickness of the seam, t = q + h;
• b - a gap.

The main geometric parameters of fillet welds:

main geometric parameters of fillet welds

• k - a leg fillet weld - the shortest distance from the surface of one of the parts being welded to the border fillet weld on the surface of the second work piece;
• q - the convexity of the joint;
• p - the estimated height of the fillet weld - the length of the perpendicular line drawn from the point of maximum penetration at the site of conjugation of welded parts to the hypotenuse of the largest right triangle inscribed in the outer part of the fillet weld;
• a - thickness of the fillet weld, a = q + p.

The aspect ratio of the seam - the ratio of width to its thickness.

K n = E / t

The value of the weld shape is usually in the range of 0.5 to 4. The optimal value is between 1.2 and 2.

The coefficient of convexity of the joint - the ratio of width to its convexity.

K y = E / q

The value of the convexity of the weld should not exceed 7-10.

Factor share of the base metal in the weld metal :

K a = F a / (F a + F e ) ,

where F a - cross-sectional area of the molten base metal, F e - cross-sectional area of weld electrode metal.

base metal in the weld metal

The root of the weld seam is a part which is furthest from his face. Podvarochny seam - lower part of the bilateral joint performed in advance to prevent burn-through in the future the main seam welding or placed in the least to the root of the weld.

root of the weld

Weld seams and joints:
geometry of the weld seam
weld classification
the effect of welding parameters on the shape and size of weld