6.1 Materials
6.1.1 Material selection
A) tee raw materials made by oxygen blowing of converter and electric furnace smelting of fully killed steel and require toughness and heat treatment
State.
B) is chosen to make the 3-way surface should be without too much grease, rust, flux and corrosion, low melting point metal contamination.
c) The material marks are clear and complete in accordance with the technical requirements of the relevant provisions of the pipe fitting technical specifications.
D) certificate of raw material should be its inspection items shall comply with the provisions of the relevant standards or orders. No mark, no lot number,
The steel without quality certificate or quality specification item incomplete cannot be used. ,
E) are not allowed in the process of manufacture, transportation, loading and unloading with low melting point metal Cu and zinc, Sn, Pb or contact
Appropriate methods should be used to remove.
6.1.2 Inspection of materials
a) Before entering the factory for inspection, use wire brush wheel Angle grinder for mechanical rust removal on the surface of materials.
b) Surface size inspection, surface and size inspection of materials after rust removal.
C) materials according to the furnace raw materials for chemical analysis of chemical composition of the maximum percentage shall comply with ASME boiler pressure capacity
Device specification II requirements.
Also 6.1.3 materials traceability identifies clear raw materials in the process of manufacturing furnace number, batch number, length, and rolled straight seam
Tube material after the serial number of the material of the material length parts, etc., should have traceability records on the material of the transplantation.
6.2 Be in charge of roll forming
6.2.1 Roll Plate Forming. Choose the suitable cutting board size after processed into tubular materials and processing according to the drawing size see volume tube
The graph.
6.2.2 Coil welding (according to welding technology card).
A) the volume tube forming machine groove and trim and layered detection of groove.
B) to the groove in good volume tube welding welding shall be in accordance with welding procedure specification by a certified welder and welder should pass X operation
Welding process evaluation of steel grade.
C) volume tube weld after welding to clean flaw detection, then UT defects of range should be allowed to meet
The requirements specified in Class I of JB4730.3-2005. but unqualified parts to repair weld repair is not of the same position
More than 2 times allowed.
Post time: May-16-2023