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As described on this page PDHs may be used to determine continuing education eligibility for recertification in the AWS Certified Welding  - Information from app.aws.org

The contractor told him no one had asked him to remove slag for years am a Certified Welding Inspector not a Certified Slag Inspector - Information from app.aws.org

In recent years laser vision sensors have been widely used to track the weld joint However they could not be used to detect the joint precisely for - Information from app.aws.org