You multiply the number of welds by the diameter of the pipe that those welds are applicable to.
porosity
A series of short welds. Looks like _ _ _ _ _
what is normal welding electrode and how it welds
by flahing the gash and sniffing the gusset juices
concave, convex and the other one which is niether concave or convex
The plural of 'weld' is 'welds', as in "He made several welds to the car frame."
concave
it welds
The opposite of convex is concave. Concave shapes have an inward curve, while convex shapes have an outward curve.
Concave is a property of [irregular] polygons. A parallelogram cannot be concave.
plano concave
no concave mirror is in shape of concave mirror
Concave, because you can connect the corners from the outside.
concave=in convex=out
Concave
There are some meaning on the term " concave up". However, in most cases, a concave is a hallow curve. A half circle with an opening is also a concave. Concave up means to concave somethings.