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SBM Quality Specification ­ Welding (v03)

SBM Mineral Processing Quality Specifications Welding

Print: 27.04.2010

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SBM Quality Specification ­ Welding (v03)

1.

WELDING .................................................................................................................................. 2 1.1. WELDING QUALIFICATION TESTS ........................................................... 2 1.2. PREPARING THE WELD ........................................................................ 2 1.3. WELDING ...................................................................................... 2 1.4. CHECKS ........................................................................................ 3 Penetrant Testing (PT) ........................................................................................................ 3 1.5. VISUAL INSPECTIONS OF THE COMPLETE COMPONENT .................................... 3

1. Welding

The welding company must fulfil the requirements of ISO 3834-4. 1.1. Welding qualification tests The welder must be able to provide a valid welding qualification for the process and materials in question according to DIN EN 287 T1/T2 . If welding is fully mechanical (robot) then the personnel must provide a valid welding qualification and an operating certificate according to DIN EN 1418. 1.2. Preparing the weld When not otherwise indicated in the drawing, the weld must be prepared compliant to EN ISO 9692-1. In the area around the weld, parts must be metallically bare before welding (no rust, mech. residue, oil, paint, fat, scale, dust, etc.). 1.3. Welding If a steel with a higher level of rigidity is welded to a steel with a lower level then the filler material is chosen according to the steel with the lower rigidity except when a filler material with a higher rigidity is specified due to the existing load. Vertical-down welds and vertical-up welds are not permitted! Make sure the root is completely covered and avoid incomplete fusion . DIN EN 25817 group B generally applies to the quality of welding work. At Table 1 in DIN EN 5817 for irregularities Assessment Group C applies as long as nothing else is indicated in the design drawings.

Print: 27.04.2010

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SBM Quality Specification ­ Welding (v03)

When selecting the welding parameters, the power values for MAG welding must be kept in each case. All safety requirements must be observed! If the drawing or the product specification indicates that special welding instructions (shaft horse power) are required, then this must be carried out compliant to ISO 15609-1 and sent to SMB on request. Weld connections must always be hardened on the face side if no seam runout is indicated. Weld connections must not be hardened if seam runout is indicated. Welding sequences must be selected to keep strains and deformations to a minimum. An appropriate welding sequence (according to SBM work instructions) must be observed. Each welder is responsible to ensure that his/her work is carried out without error (workman self-check)! This self-check is regulated at SBM Mineral Processing in the VA 5.09.07 Rev. C. If there is no such corresponding work instruction then the suppliers must create one. Storage and handling of filler material must be dealt with in agreement with the recommendation of the supplier. 1.4. Checks All welds must be subjected to a random visual inspection compliant to EN 970 and assessment/evaluation compliant to DIN/EN 5817-C (Quality Class 2) by the SAP during and after production. Penetrant Testing (PT) If the drawing or the product specification indicates that a PT check is required then this must be carried out compliant to DIN/EN 571-1 and the assessment compliant to DIN/EN 1289. An inspection document compliant to EN 10204-3.1 must be issued and sent to the quality assurance department of SBM. 1.5. Visual inspections of the complete component The following visual inspections must be made: · Check execution of work with regard to agreement to the drawings and the surface quality. · Check cleanliness of surfaces and the boreholes. · Rust and scale, slag and weld spatter must be removed.

Print: 27.04.2010

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