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5.26.1.3 says unacceptable slag inclusions shall be removed. As you pointed out, 5.30 says the slag is to be removed and the adjacent base metal cleaned (such as with a wire brush). I see nothing that says any slag is acceptable on the surface (only inside while doing RT or UT). I interpret that to say no slag is acceptable on the surface. I think the slag needs to be removed from a slag pocket to determine what the weld really looks like. It then should be compared with code acceptance criteria. If a particular welder is consistently having this problem, his supervisor should be notified so some sort of correction can be made.
Someone has to remove the slag. It is my opinion that it is really the welder's responsibility to remove slag. I 'fight' with welders and production about the amount of slag and spatter left on welds. Since I believe welder should be the first to VT their own welds, when I find significant amounts of slag, I ask them how they performed that VT. Blasting (depending upon cleanliness level such as brush blasting) does not always remove it. Galvanizing operations do not remove slag but sure highlight it when pieces get back. Loose spatter is a problem at the coating operation. When it gets bad, I don't inspect the pieces until the supervisor sends the welders back to clean them. But reality says I carry a flashlight and a chipping hammer to do my VT. I have never in my weld inspection career (at fabricators or during field erection) been blessed with welders that completely clean their welds so that I did not have to occasionally clean some slag or spatter while inspecting. Seems like a fact of life.
AWSD1.1 Visual Inspection Acceptance Criteria
All welds shall be visually inspected and shall be acceptable if the criteria of Table 6.1 AWS D1.1 are satisfied.

When we are inspecting the component which are constructed base on ASME SecVIII or SecI there are no criteria for acceptance of visual defects. Microsoft teams flow. For example in AWS D1.1 there is a table in part6 which describe all of the criterias for visual inspection. Could anybody help me please?

To more explanation about Visual Inspection Acceptance Criteria you can open AWS D1.1 section 6 (inspection) part C.

Before you inspect and make decision about weld as per AWS D1.1, you must know definitions of:

Aws D1 1 Visual Inspection Acceptance Criteria Requirements

Aws D1 1 Visual Inspection Acceptance Criteria
  1. Section 4.8.1—The visual inspection acceptance criteria for welding procedure and welder performance tests was revised to differentiate between fillet and groove weld tests. Table 4.5—Changes were made to essential variables regarding constant voltage, constant current, voltage, heat.
  2. DYE PENETRANT INSPECTION - AWS D1.1. Acceptance criteria is dependent on service condition. Refer to the relevant project NDT Supervisor or Area NDT Manager. DYE PENETRANT INSPECTION - ANNEX - II. ULTRAVIOLET LIGHT INTENSITY VERIFICATION.
Acceptance
1. Statically Loaded Nontubular Connections (more detail see Section 2 part B AWS D1.1)
2. Cyclically Loaded Nontubular Connections (more detail see Section 2 part B,C AWS D1.1)
3. Tubular Connection (all Load) (more detail see Section 2 part D AWS D1.1)
Below Summary Visual Inspection Acceptance Criteria As per AWSD1.1 Table 6.1 :
- Any Crack shall be unacceptable, regardless of size or location
- All craters crack (start/end) shall be filled, except for the end of intermittent fillet weld outside of their effective length
- All weld profiles shall be free from cracks, overlaps, and the unacceptable profile discontinuities exhibited in Figure 5.4.
- Visual inspection of welds in all steels may begin immediately after the completed welds have cooled to ambient temperature. Acceptance criteria for ASTM A 514, A 517, and A 709 Grade 100 and 100 W steels shall be based on visual inspection performed not less than 48 hours after completion of the weld.
- The size of a fillet weld in any continuous weld may be less than the specified nominalsize (L) without correction by the following amounts (U) on Table 6.1
- Undercut and porosity see more detail on Table 6.1
Methods of Testing and Acceptance Criteria for WPS Qualification (Section 4) Visual Inspection.

Aws D1.1 Weld Acceptance Criteria

For acceptable qualification, welds shall meet the following requirements:
(2) All craters shall be filled to the full cross section of the weld.
(3) The face of the weld shall be flush with the surface of the base metal, and the weld shall merge smoothly with the base metal. Undercut shall not exceed 1/32 in. [1 mm]. Weld reinforcement shall not exceed 1/8 in. [3 mm].
(4) The root of the weld shall be inspected, and there shall be no evidence of cracks, incomplete fusion, or inadequate joint penetration. A concave root surface is allowed within the limits shown below, provided the total weld thickness is equal to or greater than that of the base metal.
(a) The maximum root surface concavity shall be 1/16 in. [2 mm] and the maximum melt-through shall be 1/8 in. [3 mm].
(b) For tubular T-, Y-, and K-connections, melt-through at the root is considered desirable and shall not be cause for rejection.
(CMIIW)
by online welding courses – non destructive testing
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