AWS D1.1 CLUSTER POROSITY INTERPRETATION

By biju Date 04-19-2019 09:39

AWS CLAUSE 6.12.1
(5) Isolated discontinuities such as a cluster of rounded indications, having a sum of their greatest dimensions exceeding the maximum size single discontinuity allowed in Figure 6.1. The minimum clearance to another cluster or an elongated or rounded discontinuity or to an edge or end of an intersecting weld shall be three times the greatest dimension of the larger of the discontinuities being considered.

Please clarify the above statement. How we will take the sum of porosity in a cluster. I understood that the porosity having length more than 2.5 mm shall be added and evaluate accordingly. If not what is the minimum size of porosity to be considered in a cluster for taking the sum of all porosity
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By SWN1158 (***)

Date 04-19-2019 10:59

Figure C-6.8 in the commentary section may be helpful... "llustration of Discontinuity Acceptance Criteria for Statically Loaded
Nontubular and Statically or Cyclically Loaded Tubular Connections 1-1/8 in. and Greater, Typical of Random Acceptable Discontinuities (see 6.12.1)"

By biju Date 04-19-2019 14:52

Thanks. The clarification is required on the statement; that is the cluster of rounded indications having their sum. How we will take sum ie measuring all pores in the cluster or by taking sum of the relevant pores those have dimensions greater than 2.5 mm. No need to take sum of no relevant indications that is pores than 2.5 mm in diameter in the cluster .