Questions about crane welding process qualification standards

All welds should be qualified according to ISO-15614, but butt welds such as 6+6, 8+8 and steel pipe welds are qualified. Crane Specification 6067

Welding process qualification is the test process and result evaluation to verify the correctness of the proposed weldment welding process.

Welding process qualification is an important measure to ensure quality, and provides a reliable basis for the formal formulation of welding process instructions or welding process cards. It confirms the correctness and reasonableness of the welding process instructions prepared for various welded joints. Welding, also known as welding, is a manufacturing process and technology that joins metals or other thermoplastic materials, such as plastics, by means of heat, high temperature, or high pressure.

For both product manufacturing and installation, welding process qualification should be carried out before the formal welding work begins, that is, to evaluate whether the welding process meets the requirements. The scope of application of welding process qualification includes the manufacturing, installation and maintenance of steel equipment such as spacecraft, ships, nuclear energy, load-bearing steel structures, bridges, pressure vessels, pressure pipelines and boilers.

Generally, three layers of six-millimeter plates will do. Not necessarily. See JB T4708 for the dimensions of the welding test plate.

After the non-destructive testing is done, samples are taken from the test plate for tensile, bending, and impact experiments.

I can't go into enough detail.

Process qualification includes: welding method, base metal, welding consumables, welding position, welding specification, non-destructive testing, physical and chemical analysis, etc.

If you don't have the base metal grade here, you don't know if the welding rod you chose is right? With such a plate thickness, under normal circumstances, two layers of welding are sufficient. If you don't do the impact test, it is enough for the test plate to be 300mm long, but considering that when the physical and chemical experiments are actually carried out, individual samples may be unqualified and need to be doubled, so the test plate should be 400mm long, or weld an additional test plate.

Draw up a Pre-Welding Practice Specification (PWPS), then verify your PWPS against your PWPS welding specimens, and then make a Welding Procedure Qualification Report (PQR).

Who has a version of the pressure pipe welding process qualification report, please send it to me. Mailbox.

Thank you!!!

Welding process qualification should be based on reliable steel weldability and completed prior to engineering welding.

In principle, the welding parameters used in the qualification of the welding process are determined according to the weldability test results of the welded steel, especially the heat input, preheating temperature and postheating temperature. For mature steel grades produced at home and abroad that have been fully understood, have clear guiding welding process parameters, and have been used for a long time in practice, there is generally no need for weldability tests by construction enterprises.

The weld should be uniform and full, and there should be no slag inclusion and pores, and no bias welding, false welding, and virtual welding. The pressure test is required to meet the requirements. If there is no requirement for pressure testing, the mechanical strength requirements of the workpiece must be met.

The welding process qualification should be carried out according to the specific welding content, and the following is an example.

Purpose This procedure is used to guide the operator to operate and use the equipment correctly.

2 Scope of application This regulation is applicable to guide the operation and safe operation of the company's welding work.

3 Manage content.

Operation. Use the welding machine in strict accordance with the data on the nameplate of the welding machine, and shall not be overloaded.

The current should be adjusted in the no-load state, and a long-term short circuit is not allowed when the welding machine is working.

Before using the welding machine, it should be checked that the wiring of the welding machine is correct, the current range meets the requirements, the shell is grounded reliably, and there are no foreign objects in the welding machine before it can be closed.

When working, there should be no strong vibration in the core of the welding machine, and the screws that compress the core should be tightened. The temperature of the welding machine and the current regulator should not exceed 60°C.

Strengthen maintenance work, keep the inside and outside of the welding machine clean, ensure that the welding machine and welding flexible wire are well insulated, and repair it immediately if there is damage or burns.

Regularly check the technical condition of the circuit of the welding machine and the insulation performance of the welding machine, and eliminate any problems in time.

Safety Operating Procedures.

When the construction personnel are operating, they must wear all kinds of labor protection supplies, such as work clothes, work hats, gloves, foot covers and other work clothes, which should not be tied in the waist of the trousers, and the foot covers should be tied in the trouser legs.

In welding and cutting workplaces, fire protection equipment such as fire hydrants, fire extinguishers, sand boxes, and buckets filled with water are mandatory.

When welding operations are carried out in non-fixed places, it is necessary to apply for a fire certificate first, and require guardians and fire prevention measures before operation.

When working at height, the high-altitude work permit should be applied for first, and the construction personnel should wear safety belts and abide by other relevant regulations of high-altitude work.

During the construction process, the construction personnel should be careful not to be injured by arc light and metal splashes, so as to prevent the occurrence of accidents and other injuries.

When the welding or cutting work is completed, carefully inspect the surroundings of the welding site to confirm that there is no danger before leaving the site.

Welding construction inspection records.

Project Name The name of the sub-project.

Pipeline Name Construction drawing number.

Construction standards or specifications Welding process evaluation number.

Pipe Grade, Welding Consumables, Weld Number, Wolder.

Stamping welding.

Daily welding.

Location beveling.

Type welding.

Method Preheating or postheating temperature Weld repair Weld inspection rating and results Remarks Appearance Flaw detection Comprehensive 1 2 3 4 5 6 7 8 9 10 Quality inspector: Site leader: Audit: year, month and day.

The standard of process qualification is a domestic standard.

1 NB T47014-2011 "Welding Process Qualification for Pressure Equipment".

2 GB50236 98 "Field Equipment, Industrial Pipeline Welding Engineering Construction and Pressure Pipeline Process Qualification".

3. "Steam Boiler Safety Technical Supervision Regulations (1996)" Note: This standard is borrowed from the process evaluation of the lifting industry.

4 SY T0452 2002 "Petroleum Gas Pipeline Welding Process Qualification Method" (Note: for petroleum, chemical process qualification).

5 JGJ81 2002 "Technical Regulations for Welding of Building Steel Structures" (Note: Highway Bridge Process Assessment can be referred to the implementation).

6 SY T4103 2006 "Welding and Acceptance of Steel Pipes".

Welding Process Qualification of Steel Pressure Vessels".

European standards. EN 288 or ISO 15607 - ISO 15614 series of standards.

ISO15614-1 Arc welding and gas welding of steel Arc welding of nickel and nickel alloys.

ISO15614-2 Arc welding of aluminum and aluminum alloys.

ISO15614-3 cast iron arc.

ISO15614-4 repair welding of cast aluminum.

ISO15614-5 Arc welding of titanium and titanium alloys Arc welding of zirconium and zirconium alloys.

ISO15614-6 Arc welding of copper and copper alloys.

ISO15614-7 surfacing welding.

ISO15614-8 Welding of pipe joints and tube sheet joints.

American Standards. 2005 Code for Welding of Steel Structures.

2003 Welding regulations for aluminum structures.

Welding regulations for thin plate steel structures.

2002 Bridge welding.

1999 Stainless steel welding.

2005 Welding Regulations for Lifting Machinery.

Welding process qualification includes the following information.

1. Submit the welding process qualification test plan

1) Grade, grade, thickness and delivery status of the base metal;

2) The type, grade and specification of welding materials (welding rods, welding wires, fluxes and shielding gases);

3) The model and main performance parameters of the welding equipment;

4) Groove design and processing requirements;

5) Weld bead layout and welding sequence;

6) Welding position (flat, vertical, horizontal, vertical welding, etc.).

7) Welding specification parameters (power supply polarity, welding current, arc voltage, welding speed and shielding gas flow, etc.);

8) Preheating before welding, temperature control between the tracks, heat treatment after welding, and stress relief measures after welding, etc. (if necessary);

9) Welding environment (such as on-site welding, workshop welding or laboratory welding);

10) inspection test items and requirements after welding;

11) the interception position diagram of each sample in the test project carried out after welding and the processing size drawing of each sample;

12) Other relevant special requirements.