What are the welding method codes? What is the weld symbol?

Weld symbols are generally composed of basic symbols and guide lines, and can also be supplemented with auxiliary symbols, supplementary symbols and weld dimension symbols if necessary. The form of the weld and the size of the groove are generally represented by the method of technical drawing on the drawing. In order to simplify the representation method of weld on the drawing, the expression method of weld symbol and groove size specified in the national standard is now adopted.

The welding symbol is shown in the figure below:

Purpose of welding. Welding achieves the purpose of bonding through the following three ways:

1. Fusion welding - heat the workpiece to be joined to make it partially melted to form a molten pool, the molten pool will be joined after cooling and solidifying, and the melt filler can be added to assist if necessary, it is suitable for the welding of various metals and alloys, without pressure.

2. Pressure welding - the welding process must apply pressure to the weldment, which belongs to the processing of various metal materials and some metal materials.

3. Brazing - using metal materials with lower melting point than the base metal as brazing metal, using liquid brazing metal to wet the base metal, filling the joint gap, and diffusion with the base metal to achieve link weldments. It is suitable for the welding of various materials, and also suitable for the welding of different metals or dissimilar materials.

The various welding symbols are expressed and described as follows:

1. The structural form of welding is represented by welding symbols, which are mainly composed of basic symbols, auxiliary symbols, supplementary symbols, guide lines and welding dimensions. The commonly used welding symbol is shown in the following figure, which is used to illustrate the shape of the welding cross-section balance, and the line width is 1 10 of the height of the marked character, if the word height is, the symbol line width is.

2. Welding auxiliary symbols, as shown in the figure below, are symbols that represent the shape of welding, such as bulge or concave.

3. Supplementary symbols, as shown in the figure below, are used to indicate the range of welding and other characteristic symbols.

Welding symbol annotation steps:

1. Mark the dimensions on the welding cross-section on the left side of the basic welding symbol, such as the blunt edge height p, the groove depth h, the welding angle height k, etc., if there is no marking on the left side of the welding and there is no other description, the welding should be completely penetrated.

2. On the right side, mark the direction and size of the welding length, such as the number of welding sections N, the length L, and the clearance E. If there is no annotation to the right of the basic symbol and no other description, it means that the weld is continuous along the entire length of the workpiece.

3. On the upper or lower side of the welding symbol, mark the groove angle, the groove surface angle and the root and the gap B.

4. Mark the number n and welding method of the same welding at the end of the guide line.

Welding, also known as welding, is a manufacturing process and technology that joins metals or other thermoplastic materials, such as plastics, by means of heat, high temperature, or high pressure.

Welding position code: SAW: submerged arc automatic welding.

The welding position is the spatial position of the weldment seam during fusion welding, which can be expressed by the weld inclination angle and the weld rotation angle. There are positions such as flat welding, vertical welding, horizontal welding, and vertical welding. Flat welding is the easiest to ensure the quality of welding, followed by horizontal welding, followed by vertical welding, and vertical welding is the most difficult to ensure quality, so it should be avoided as much as possible.

The welding position refers to the spatial position of the weldment seam during fusion welding, which can be expressed by the weld inclination angle and the weld rotation angle.

The welding position is referred to as the welding position. The relative spatial position of the weld to the welder during welding. There are positions such as flat welding, horizontal welding, vertical welding, and vertical welding.

Flat welding refers to the horizontal welding carried out by the welder, so it is also called vertical welding; For the weld in the T-shaped connection, the T-belt and the code weldment are often placed at 45° to form the welding position of the vertical weld, which is also called boat-shaped welding.

Horizontal welding refers to horizontal welding by the welder at approximately the same height as the arm. Vertical welding refers to the welding of vertical welds from the bottom up by the welder. Back-up welding refers to the horizontal weld weld carried out by the welder with the head up.

Flat welding is the easiest to ensure the quality of welding, followed by horizontal welding, followed by vertical welding, and the most difficult to ensure the quality of vertical welding, which should be avoided as much as possible.

The weld is stupid which corner; The angle between the weld centerline (the centerline between the root and cap layer) and the y-axis of the horizontal reference surface. various locations; Flat welding, flat fillet welding, horizontal welding, elevation fillet welding, vertical welding, vertical welding, etc.