JB/T 5000.2-2007 in English

1 Scope
The requirements of cutting surface quality of oxygen cutting workpiece, inspection requirements and cutting quality grade requirements are specified in this part of JB/T 5000.
This Part is applicable to the flame cutting of low carbon steel, medium carbon steel and common low alloy steel who are in thickness of 6mm ~300mm.

2 Normative References
The following normative documents contain provisions which, through reference in this Part of JB/T 5000, constitute provisions of this Part. For dated reference, subsequent amendments to (excluding correction to), or revisions of, any of these publications do not apply. However, the parties whose enter into agreement according to this Part are encouraged to research whether the latest editions of these references are applied or not. For undated references, the latest edition of the normative document is applicable to this standard.
GB/T 985-1988 Basic Forms and Sizes of Weld Grooves for Gas Welding, Manual Arc Welding and Gas-shielded Arc Welding
GB/T 986-1988 Basic forms and sizes of submerged arc weld grooves

3 Terms and Definitions
The following terms and definitions are applicable to this Part.
3.1 Flame cutting
It refers to the method of using the thermal energy of gas flame to preheat the cutting part of workpiece to a certain temperature, and the high-speed cutting oxygen flow will spout to burn the workpiece and release heat to realize cutting. Flame cutting is also called gas cutting.

3.2 Tolerance of verticality
In this part, it refers to the tolerance of verticality of cutting surface profile line in the given section vertical to the base plane and the cutting length direction. The tolerance zone is the zone between two parallel straight lines which are vertical to the base plane and cutting length direction, and the distance between them is the tolerance value t, see Figure 1.

Contents
Foreword
1 Scope
2 Normative References
3 Terms and Definitions
4 Quality Requirement of Flame Cutting Surface
5 Inspection Requirements
6 Inspection Method
7 Cutting Quality Grade
8 Marking Method
Annex A (Informative)
Cutting Allowance and Minimal Cutting Diameter
Bibliography
Table 1 The tolerance of verticality and tolerance of verticality of cut surface
Table 2 Surface roughness of cut surface
Table 3 Limit deviation of length dimension of cut surface
Table 4 Limit deviation of groove angle and depth of cut surface
Table 5 Surface defect requirements of cut surface
Table 6 Shoulder melting degree requirements of cut surface
Table 7 Adherent dross requirements of cut surface
Table 8 Inspection range of verticality and gradient
Table 9 Quantity requirements of inspected part
Table 10 Cutting quality inspection
Table 11 Requirements of cutting quality grade
Table A.1 Slot width allowance
Table A.2 Reserved machining allowance of cutting workpiece
Table A.3 The minimum diameter flame cutting machine can cut is shown in Table A.3.