ISO 20168:2016 pdf free

ISO 20168:2016 pdf free.Resistance welding一Locking tapers for electrode holders and electrode caps
This document specifies the dimensions and tolerances for electrode holders and of spot welding electrode caps, where a locking taper is used.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content constitutes requirements of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
ISO 5182, Resistance welding一Materials for electrodes and ancillary equipment
ISO 5821, Resistance welding一Spot welding electrode caps
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 17677-1 and the fllowing apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
一IEC Electropedia: available at http://www.electropedia.org/
一ISO Online browsing platform: available at ht:/wwwiso.org/obp
3.1 locking taper
taper allowing for a tight fit between an electrode holder and the electrode cap as their taper angles differ by 0° 2′ 60″, ensuring the electrode cap engagement point is at the skirt of the cap and electrode holder
Note 1 to entry: See Figure 1.
Note 2 to entry: Traditionally called “Fisher taper”.
Note 3 to entry: During welding, the electrode cap tightens further on the electrode holder.
4.1 General
Table 1 gives the dimensions for three typically used electrode cap and holder sizes: 13 mm, 16 mm and 20 mm.
The taper angles of electrode caps and holders are to be verified by the use of certified ring gauges
and plugs.
4.2 Electrode holders
The taper of the electrode holders shall be 2° 58′ 54″ in accordance with Figure 2.
4.3 Electrode caps
The taper of the electrode caps shall be 2° 56′ 53″ in accordance with Figure 2.
5.2 Electrode caps
Electrode caps shall be designated in accordance with ISO 5821, except the number of this document shall be used to indicate that the cap has a locking taper.
EXAMPLE A spot welding electrode cap type BO, width d1 = 16 mm, length/1 = 20 mm, d2 = 8 mmanda= 45, is designated as follows.ISO 20168 pdf download.