General Principles - Definitions

All standardized bevels are supposed to be an 'instance' of a number of basic bevel types (or bevel types, for short).

Each bevel type is identified by a number, fixed by AVEVA, and has a number of parameters associated with it. All the currently available bevel types are specified in detail in this document.

The customer defines a bevel standard of his own as a number of instances of the basic bevel types, each identified by a user selected number, called the user bevel code (or

bevel code, for short). Each bevel code is defined by either assigning fixed values to its parameters or by making them depending on the connection angle between the elements

(fillet welding only!).

If two plates with different plate thicknesses are butt welded together, the difference might call for a variant of the basic bevel type. The different variants are also described below.

Such a variant might include extra machining, resulting in a chamfer.

The thickness of the thinner plate in a butt joint is called the e-measure of the bevel on the thicker plate.

Most bevel types have an opening angle in one or both of the sides of the plate. The opening angle in the positive direction is denoted Alpha and in the negative direction Beta.

U-shaped bevels have a user controllable arc (radius) in their cross section geometry, otherwise the bevel sections consist of straight lines.

Some bevels have got a nose or a sharp knee. The bevel definition may include a gap between the center of the joint and the edge of the plate after preparation (to be filled in during the welding).

In the bevel definition a bevel has one side "up" and one side "down" related to the upper and lower plate surfaces, respectively, in the figures below. In this document the upper side

is called the positive side of the bevel, the lower side is called the negative side.

When the positive side of a bevel is upwards in a drawing of a plate the bevel is said to be in a normal position, when it is downwards it is said to be reflected.

These concepts are illustrated in the figure below.

Figure 1:2 Definition of terms related to bevels.

Some bevel types may also have a second opening angle ( see figure below). The width of the second opening angle on the edge of the plate, will be found in production data.

When evaluating the chamfer of a bevel there are two different options available. The default situation is that the extension of the chamfer line will reach the level of the abutting plate in the center of the joint, see the figure below.

Figure 1:3 Normal chamfer

The second possibility is that the chamfer line reaches the level of the abutting plate in the knuckle point of the bevel contour, see the figure below.

Figure 1:4 "Wide chamfer

This will lead to a wider chamfer and is selected via assignment (of any value) to the environment variable SBH_WIDE_CHAMFER.