There are many different types of weld defects that can occur during the welding process. Here is a list of some common weld defects:

• Incomplete fusion: This occurs when the weld metal does not fully fuse with the base metal or previous weld passes. This can result in a weak weld and potential failure.
• Porosity: This is a type of gas defect that occurs when gas bubbles become trapped in the weld metal. Porosity can weaken the weld and make it more susceptible to cracking.
• Cracks: Weld cracks can occur for a variety of reasons, including improper welding technique, incorrect welding parameters, or the use of faulty equipment. Cracks can weaken the weld and make it more susceptible to failure.
• Lack of penetration: This occurs when the weld does not fully penetrate the base metal, leaving a thin or incomplete weld. This can result in a weak joint and potential failure.
• Undercut: This occurs when the weld metal melts and flows away from the base metal, creating a groove or indentation along the edge of the weld. Undercut can weaken the weld and make it more susceptible to cracking.
• Slag inclusions: This occurs when slag, which is a byproduct of the welding process, becomes trapped in the weld metal. Slag inclusions can weaken the weld and make it more susceptible to cracking.
• Tungsten inclusions: This occurs when tungsten, which is used as a filler metal in some welding processes, becomes trapped in the weld metal. Tungsten inclusions can weaken the weld and make it more susceptible to cracking.
• Misalignment: This occurs when the parts being welded are not properly aligned, resulting in a poorly formed weld. Misalignment can weaken the weld and make it more susceptible to failure.

As you can see, there are many different types of weld defects that can occur during the welding process. It is important to carefully inspect all welds for defects in order to ensure the strength and integrity of the finished product.