Steel Buildings in Europe

Part 10: Model Construction Specification 10 - 49 Proposed Clauses Commentary 9.5.9 All surfaces to be welded shall be dry and free from material that would adversely affect the quality of the welds or impede the process of welding. Such as rust, organic material or galvanizing. 9.5.10 Requirements of § 7.5.1 to 7.5.16 of EN 1090-2 shall be applied as appropriate. 9.6 Acceptance criteria 9.6.1 Welded components shall comply with the requirements specified in § 10 and 11 of EN 1090-2. 9.6.2 The acceptance criteria for weld imperfections shall conform to the requirements of § 7.6 of EN 1090-2. 10. MECHANICAL FASTENING 10.1 General 10.1.1 Minimum nominal fastener diameter, bolt length, length of protrusion, length of the unthreaded bolt shaft and clamp length shall comply with the requirements of § 8.2.2 of EN 1090-2. 10.1.2 Requirements given in § 8.2.3 of EN 1090-2 for washers shall apply. 10.1.3 Tightening of non-preloaded bolts shall comply with the requirements of § 8.3 of EN 1090-2. The bolt shall protrude from the face of the nut, after tightening, not less than one full thread pitch. 10.1.4 Precautions and preparation of contact surfaces in slip resistant connections shall comply with the requirements of § 8.4 and Table 18 of EN 1090-2. Slip factor shall be determined by test as specified in Annex G of EN 1090-2. 10.1.5 Tightening methods of preloaded bolts shall comply with the requirements of § 8.5 of EN 1090-2; special requirements are specified on the relevant documents. 10.2 Bolts 10.2.1 Bolt sizes for structural bolting shall be as specified on the drawings. 10.2.2 Where the structure has been designed to utilise the shear resistance of the unthreaded shank of bolts, this is specified on the drawings and the dimensions of the bolts are given. The locations and dimensions must be given on the drawings. Reliance on the resistance of the unthreaded shank, rather than the threaded part, is inadvisable because it requires a higher level of control on bolt supply and installation to ensure that only unthreaded parts exist in the part of the connection where the resistance to shear is required. 10.3 Nuts 10.3.1 Nuts shall be assembled so that their designation markings are visible for inspection after assembly.