تقوم الشركات بإنتاج منتجات لحام تتوافق مع المعايير الأوروبية والأمريكية، وترغب في إرسال مهندسي اللحام للحصول على شهادات، فأي نوع من الشهادات يُفضل الحصول عليه؟

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