Valid

HG/T 4281-2011Welding procedure specification for plastics (English PDF)

塑料焊接工艺规程

Preview PDF

This is a limited preview

Buy now to download the full PDF (25 pages)

Need quotation for your management?

Get a formal quotation for HG/T 4281-2011 in 30 minutes.

Issued by

MIIT

Level / Type

Industry · Recommended

Issue date

December 20, 2011

Implementation date

July 1, 2012

Scope

HG/T 4281-2011 is the English-translated version of 塑料焊接工艺规程.

HG/T 4281-2011 is the Chinese standard "Welding procedure specification for plastics". Its scope clause reads: This standard specifies the terms and definitions of plastic welding specification, hot-gas welding, extrusion welding, fusion welding and electrofusion welding specifications, quality inspection and requirements for welders.

This standard is applicable to the welding specifications for pipes and plates of thermoplastics and plastic alloys, such as polyvinyl chloride [PVC: including chlorinated polyvinyl chloride (PVC-C), unplasticized polyvinyl chloride (PVC-U), soft polyvinyl chloride (PVC-R)], polypropylene [PP: including polypropylene block copolymer (PP-B), polypropylene photopolymer (PP-H), polypropylene random copolymer (PP-R)], polyethylene [PE: including high density polyethylene (PE-HD), medium density polyethylene (PE-MD), low density polyethylene (PE-LD), polyvinylidenefluoride) (PVDF), polytetrafluoroethylene (PTFE-TFM) acrylonitrile/butadiene/styrene plastics (ABS), polyamide (PA). Its clauses include terms and definitions.

Found what you need?

Document preview — HG/T 4281-2011

National Standard of the People's Republic of China

Issued by: Ministry of Industry and Information Technology of the People's Republic of China

Foreword i
1 Scope
2 Normative references
3 Terms and definitions
4 Overview for plastic welding procedures
4.1 Types, codes, characteristics and methods of welding procedures
4.2 Types of welds, joints and grooves
4.3 Welding process record
5 Hot-gas welding
5.1 General
5.2 Welding machinery
5.3 Welding procedure
5.4 Welding parameters
6 Extrusion welding
6.1 General requirements
6.2 Welding machinery
6.3 Welding procedures
6.4 Welding parameters
7 Fusion welding
7.1 General requirements
7.2 Welding machinery
7.3 Welding procedures
7.4 Welding parameters
8 Electrofusion welding
8.1 General requirements
8.2 Welding machinery
8.3 Welding procedures
8.4 Welding parameters
9 Quality inspection
9.1 Welding quality requirements for hot-gas welding and extrusion welding
9.2 Quality inspection for fusion welding
9.3 Electrofusion welding quality inspection
10 Requirements for welders
10.1 Theoretical and technical requirements
10.2 Procedure requirements
10.3 Qualification requirements
Annex A (Informative) Corresponding table of plastic materials and welding methods used
Annex B (Normative) Types of welds, joints and grooves
Annex C (Informative) Record form of welding process
Annex D (Normative) Parameter of welding procedure

1 Scope

This standard specifies the terms and definitions of plastic welding specification, hot-gas welding, extrusion welding, fusion welding and electrofusion welding specifications, quality inspection and requirements for welders.

2 Normative references

The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced documents (including any amendment) applies.

GB/T 6111 Thermoplastics pipes for the conveyance of fluids - Resistance to internal pressure - Test method

GB/T 19806 Plastic pipes and fittings - Crushing decohesion test for polythylene (PE) electrofusion assemblies

GB/T 19808 Plastics pipes and fittings - Peel decohesion test for polyethylene (PE) electrofusion assemblies of nominal outside diameter greater than or equal to 90mm

GB/T 19810 Polyethylene (PE) pipes and fittings - Determination of the tensile strength and failure mode of test pieces from a butt-fused joint

GB/T 20674.1 Plastics pipes and fittings - Equipment for fusion jointing polyethylene systems - Part 1: Butt fusion

GB/T 20674.2 Plastics pipes and fittings - Equipment for fusion jointing polyethylene systems - Part 2: Electrofusion

HG/T 4280 Welding procedure qualification for plastics

HG/T 4282 Test method of tensile for plastics welded test specimen

HG/T 4283 Test method of bending for plastics welded test specimen

CJJ 63-2008 Technical specification for polyethylene (PE) fuel gas pipeline engineering

TSG D2002-2006 Regulation on welding technology for gas supply polyethylene pipe

3 Terms and definitions

For the purposes of this standard, the following terms and definitions apply.

3.1 hot-gas welding

welding method by which a plastic welding surface and plastic welding rod/wire are heated to plastic state with hot gas and then connected together under external pressure, including round nozzle hot-gas welding and high-speed nozzle hot-gas welding

3.2 round nozzle hot-gas welding

welding method by which a welding rod is heated with gas from a round nozzle, and the welding rod and the base metal are welded together by hot gas; by moving the nozzle slowly along the weld, heat up the area of welding rod and base metal at the same time with hot gas; the welding direction should be perpendicular to the base metal, and the nozzle moves up and down along the sector area of the welding rod and base metal

3.3 high-speed nozzle hot-gas welding

welding method by which a welding rod in plasticized state is pressed on the welding surface through heating welding rod with a beam-inclined nozzle, and the welding rod automatically moves along with the nozzle

3.4 extrusion welding

welding method by which the plastic welding rod and the surface to be welded are preheated with hot gas, and the welding rods are connected together after being fed and pressurized by screw

3.5 fusion welding

welding method by which after heating the two plastic end faces of plastics with heating part, remove the heating part quickly, and then weld the two plastic end faces together under appropriate pressure, including butt fusion welding, socket fusion welding and saddle fusion welding

3.6 butt fusion welding

connection method by which two plastic end faces are joined together under certain pressure, with joint cooled for a required period under the pressure, after the two end faces are heated to a viscous flow state with special heating part and the heating part is removed

3.7 socket fusion welding

connection process in which insert the outer surface of a pipe and the inner surface of a fitting into the die of the welding machine without rotation at the same time and heat for seconds, then quickly remove the welding machine, and quickly insert the heated pipe vertically into the fitting, keeping pressure and lowering temperature […]

......
This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 25 pages — is available in the English PDF.

Referenced standards

Cited by

Similar standards

HG/T 5100-2016|HG/T 5101-2016|HG/T 5102-2016|HG/T 5103-2016|HG/T 5104-2016|HG/T 4750-2014

How to Download HG/T 4281-2011

1
Add to cart
Click "Download PDF" on this page and choose "Buy this standard". You can add more standards before checkout.
2
Checkout
Enter your email and billing details. Payment is processed securely by Stripe (cards or bank transfer). Prefer bank details? Request a quotation (min. order $300).
3
Instant delivery (0–9 sec)
Delivery is automatic: within seconds of payment you'll receive an email with a secure download link. The link stays valid for 72 hours.
4
Invoice included
A tax invoice is attached to the confirmation email. Need a custom invoice? Contact us.