ANSI/AWS B4.0 is an American national standard for the mechanical testing of welds. Welds are integral to the construction of metal structures, and it is critical that their properties be thoroughly tested to ensure structural integrity. ANSI/AWS B4.0 covers a wide variety of common tests including tension tests, shear tests, bend tests, fracture toughness tests, hardness tests, and others. This standard extensively references ASTM test methods such as ASTM E8 and specifies how to use these test methods when assessing weldments.