Lab Report: To study various types of metal joining processes.

 Experiment Name: To study various types of metal joining processes.

Introduction:

Welding is a fabrication process whereby two or more parts are fused using heat, pressure, or both forming a join as the parts cool. Welding is usually used on metals and thermoplastics but can also be used on wood. The completed welded joint may be referred to as a weldment.

Objective:

1. To learn different types of welding processes.

2. To learn the brazing process.

Welding:

Wielding are two types-

1. Arc welding.

2. Gas welding 

Arc welding:

Arc welding is a type of welding process using an electric arc to create heat to melt and join metals. A power supply creates an electric arc between a consumable or non-consumable electrode and the base material using either direct (DC) or alternating (AC) currents.

Types of Arc welding: There are 6 types of welding included below-

1. Bead welding: To join only the top and bottom surfaces. A weld bead is created by depositing a filler material into a joint between two pieces of metal.

Figure: Bead welding

2. Butt joint welding: Butt welding is when two pieces of metal are placed end-to-end without overlap and then welded along the joint. Importantly, in a butt joint, the surfaces of the workpieces being joined are on the same plane and the weld metal remains within the planes of the surfaces. 

   Figure: Butt joint welding

3. Corner joint welding: Joint two corners of the workpiece. Corner joint welding refers to instances in which two materials meet in the “corner” to form an L-shape.

Figure: Corner joint welding

4. Edge joint welding: Joint two edges of the workpiece. In an edge joint, the metal surfaces are placed together so that the edges are even. One or both plates may be formed by bending them at an angle. The purpose of a weld joint is to join parts together so that the stresses are distributed.

Figure: Edge joint welding

5. Lap welding: Overlapping of the two parts. Lap welding joints are essentially a modified version of the butt joint. They are formed when two pieces of metal are placed in an overlapping pattern on top of each other. They are most commonly used to join two pieces with differing thicknesses together. Welds can be made on one or both sides.

6. Tee welding: Joint two parts to make a shape like T. Tee welding joints are formed when two pieces intersect at a 90° angle. This results in the edges coming together in the center of a plate or component in a 'T' shape. Tee joints are considered to be a type of fillet weld, and they can also be formed when a tube or pipe is welded onto a base plate.

Brazing: Brazing is another type of metal joining process. Brazing is a metal joining process in which two or more metal items are joined together by melting and flowing a filler metal into the joint. The filler metal has a lower melting temperature than the adjoining metal. 

Figure: Brazing

Course: ME Workshop (1.2)

Credit to Mohammad Mithun (4th Batch)

Submitted By Mohammad Mithun