These gases may be trapped and form bobbles or gas pockets as the weld solidifies. Porosity is caused by gases that are present in the molten weld. Porosity is defined as cavity-type discontinuities formed by gas entrapment during solidification. Because in this article we are examining these phenomena outside the requirements of any specific welding code or standard, and we will not be discussing their limitations in terms of these documents, we will use the term discontinuities. The term “defect” designates rejectability. A defect on the other hand is defined as a discontinuity, or discontinuities, that by nature or accumulated effect (for example, total crack length) render a part or product unable to meet minimum applicable acceptance standards or specifications. A discontinuity is not necessarily a defect. The term discontinuity is defined as an interruption of the typical structure of a material, such as a lack of homogeneity in its mechanical, metallurgical, or physical characteristics. To fully understand weld discontinuities, we must first examine some welding terminology. As a welding inspector, in order for you to successfully conduct your profession, it is important to understand weld discontinuities.
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