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In welding, classes A, B, C, and D typically refer to the classification of welds based on their quality, strength, and intended use, often outlined in industry standards like AWS (American Welding Society). Class A welds are generally of the highest quality, suitable for critical applications, while Class D welds are for less critical applications or where appearance is less important. These classifications help ensure that welds meet specific performance criteria for safety and reliability in various structural applications.

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