ISO 17658:2002 溶接 — オキシ燃料フレームカット、レーザービームカット、プラズマカットの欠陥 — 用語 | ページ 2

Foreword

ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing International Standards is normally carried out through ISO technical committees. Each member body interested in a subject for which a technical committee has been established has the right to be represented on that committee. International organizations, governmental and non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.

International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 3.

The main task of technical committees is to prepare International Standards. Draft International Standards adopted by the technical committees are circulated to the member bodies for voting. Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote.

Attention is drawn to the possibility that some of the elements of this International Standard may be the subject of patent rights. ISO shall not be held responsible for identifying any or all such patent rights.

ISO 17658 was prepared by Technical Committee ISO/TC 44, Welding and allied processes, Subcommittee SC 7, Representation and terms.

International Standard ISO 17658 is closely based on the European Standard EN 12584 and therefore contains, in addition to the English and French languages, the German version.

Annex A of this International Standard is for information only.

1 Scope

This international Standard defines terms of the possible imperfections in oxyfuel gas, laser beam and plasma cuts in metallic materials which are collected and grouped. Imperfections are irregularities or deviations from the specified shape and location of cut. This international Standard only includes imperfections originating directly from oxyfuel gas, laser beam and plasma arc cutting; any adverse effects resulting from additional external stresses or strains are not considered. The type, shape and location of these imperfections are grouped together but conditions and causes of origin are not given.

Information concerning the evaluation and consequences of the above mentioned imperfections is not given because this depends on the specific job requirements. The terms have been selected to characterize the principal imperfections mentioned, however, two or more may be found simultaneously. The grouping system used is not an evaluation of quality.

2 Normative reference

The following normative document contains provisions which, through reference in this text, constitute provisions of this International Standard. For dated references, subsequent amendments to, or revisions of, any of these publications do not apply. However, parties to agreements based on this International Standard are encouraged to investigate the possibility of applying the most recent edition of the normative document indicated below. For undated references, the latest edition of the normative document referred to applies. Members of ISO and IEC maintain registers of currently valid International Standards.

4 Terms and definitions

4.1.1

melting of cut edge

pronounced rounding of the cut edge which can be on either the top cut edge or the bottom cut edge

Figure 1 — Melting of top cut edge

Figure 2 — Melting of bottom cut edge

4.1.2

string of solidified droplets

string of solidified globules adhering to either the top cut edge or the bottom cut edge

Figure 3 — String of solidified droplets adhering to the top cut edge

Figure 4 — String of solidified droplets adhering to the bottom cut edge

4.1.3

cut edge overhang

top cut edge melted over

Figure 5 — Cut edge overhang (top cut edge)

4.1.4

melted down top cut edge

excess material removed at top cut edge

Figure 6 — Melted down top cut edge

4.2.1.1

concave cut face at the edges

horizontal groove close to either the top cut edge or the bottom cut edge

Figure 7 — Concave cut face (beneath the top cut edge)

Figure 8 — Concave cut face (above the bottom cut edge)

4.2.1.2

widening of kerf

flaring of the kerf to one or both sides

Figure 9 — Widening of kerf (at the top edge of the workpiece)

Figure 10 — Widening of kerf (at the bottom edge of the workpiece)

4.2.1.3

cut angle deviation

when the bevel angle α is not as specified although kerf width is maintained

Figure 11 — Cut angle deviation

Figure 12 — Cut angle deviation at one cut face

4.2.1.4

concave cut face

hollow cut face over the entire section

Figure 13 — Concave cut face

4.2.1.5

irregular cut face profile

wavy cut face in the direction of the thickness of the cut

Figure 14 — Irregular cut face profile

4.2.2.1

excessive back run of drag line

excessive backward deflection of drag lines opposite to the cutting direction

Figure 15 — Excessive back run of drag line

^a Cutting direction

4.2.2.2

lead of drag line

pronounced drag line rake angle

Figure 16 — Lead of drag line

^a Cutting direction

4.2.2.3

local deviation of drag line

emphasized drag line irregularities in and/or against the cutting direction

Figure 17 — Local deviation of drag line

^a Cutting direction

4.2.2.5

irregular drag line depth

unacceptable unevenness in drag line depth

Figure 18 — Excessive drag line depth

Figure 19 — Irregular drag line depth

4.2.3

gouging

removal of material in the cut face, to a limited depth, generally in the cutting direction

Note 1 to entry: The width and depth of the gouges exceeds that of drag lines. Gouges can be either isolated or grouped.

Figure 20 — Isolated gouges

Figure 21 — Grouped gouges

Figure 22 — Grouped gouges on the lower cut face

4.2.4

incomplete end of cut

when material has separated before the cut is complete

Figure 23 — Incomplete end of cut

^a Cutting direction

4.2.5

non-planar cut face

when the cut face is wavy in the direction of cut

Figure 24 — Non-planar cut face

^a Cutting direction

4.3

adherent slag

slag that is difficult to remove, particularly slag that adheres to the bottom cut edge or the cut face, predominantly in the lower cut face area

Note 1 to entry: When cutting thin plates (up to 10 mm) slag can drop on both sides of the cut and fuse together and can even fill up the kerf.

Figure 25 — Slag adhering to bottom cut edge

Figure 26 — Slag patch on cut face

4.4.2

macrocrack

a crack visible with the naked eye

Figure 27 — Macrocrack in the cut face