The Flat-bottom Holed Blocks were designed based on technique 2 of the ultrasonic testing of welds in national standard GB/T 11345 - 2013 “NDT of welds-Ultrasonic testing-Techniques, testing levels, and assessment”,and GB/T 29712-2013 “NDT of welds-Ultrasonic testing-Acceptance levels”.The way how to use the Side-Drilled holes blocks to set sensitivity and make DGS was introduced.%对焊缝超声检测国家标准GB/T 11345－2013«焊缝无损检测超声检测技术、检测等级和评定»中技术2和GB/T 29712－2013«焊缝无损检测超声检测验收等级»所适用的平底孔试块进行了设计，介绍了用此平底孔试块来设定灵敏度和制作DGS曲线的方法。
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