ABOUT WELDED JOINTS

WHAT ARE TYPES OF WELDED JOINTS?

The welded joints are basically classified into three categories :

 

1. Butt Weld :

• The butt weld is obtained by placing the plates to be joined side by side with their edger nearly touching each other.
• A small gap is maintained between the edges for the filler material
• Types of Butt Welds : 

        The butt welds are further classified as :

1. Square butt weld: In the thickness of the plates is less than 5 mm, the edges of the plates do not require bevelling, and hence the joint used is known as square butt weld.
2. Single V-butt or single U-butt weld: If the thickness of the plates is between 5 mm and 12.5 mm, the edges are bevelled to V or U groove and accordingly single V-butt or single U-butt weld may be used.
3. Double V-butt or double U-butt weld: If the thickness of the plates is more than 12.5 mm, it is necessary to bevel and weld the plates from both sides. In such cases, double V-butt or double U-butt welds are used.

      2. Fillet or lap Weld :

• The fillet weld or lap weld is obtained by overlapping the two plates and then welding the edges of the plates.
• Types of Fillet or Lap Weld : 

         Based on the relative position of the load axis with respect to the fillet axis, the fillet welds are               classified into two types :

1. Parallel fillet weld: If the load axis is parallel to the axis of the fillet, it is known as parallel fillet weld.
2. Transverse fillet weld: If the load axis is perpendicular to the axis of the fillet, it is known as transverse fillet weld. The transverse fillet weld can be a single transverse fillet weld or a double transverse fillet weld.

      3.Fillet or lap Weld:

        

• In addition, the types of welded joints:

1. Corner weld;
2. Edge weld; and 
3. T-weld