Toe blend angle

The good toe blend angle for visual inspection? and refer to specification ?

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@green ideal toe blend angle is usually 20 degree to 30 degree. Just thumb rule.

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Read more ISO 5718 or ISO 6520.
Best angle of weld toe is 110 degree.

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@bien thanks for specifying the standard to refer. But in ISO 5817 (not ISO 5718-maybe wrong typying), it has 3 quality levels B, C, D. So which cases do the quality levels apply to?

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Thanks @dinhhoan05.
It should be ISO 5817.
See my latest update standards in topic BSI Standards for welding inspector

Thanks all