Special equipment, welding consumables management control link
Welding consumables procurement, inspection and reinspection, storage, drying and constant temperature storage, distribution and recycling of control points in the welding material management control link.
1 Welding Materials procurement
Procurement orders welding consumables, pay attention to the need for welding according to the pressure air devices, the higher the requirements of the Common Criteria. In August 2002, released the pressure vessel steel welding rod order JB/T4747 technical conditions on the basis of GB/T983, GB/T5117, GB/T5118, increase, improve and change a number of technical requirements.
2 Inspection and reinspection
(1) quality certificate of inspection;
(2) The packaging and appearance inspection;
(3) welding consumables reinspection.
Custody of three welding consumables
(1) partition custody
Library of welding consumables should be divided into as needed "to be seized", "qualified" and "failed" in three regions. If the enterprise at the same time the production of pressure vessels and general steel products, but also partition the pressure vessel welding materials and non-pressure vessel welding consumables District, marking and demarcation of the area should be obvious.
(2) warehouse registration
Welding consumables database administrator should be acceptance of qualified welding consumables storage registration. Registered include: welding consumables standard grades, specifications, batch or heat number, internal transplant Code, quantity or weight, date of production, warehousing, the validity of the production plant.
After the storage administrator should establish appropriate inventory file should include the storage of registration, certificate of quality, acceptance of inspection reports, inspection records, payment records.
(3) welding consumables library welding consumables custody
Welding consumables library room temperature should be above 5 ℃. Should be indoor thermometer, relative hygrometer, dehumidifiers, when relative humidity is high, you should boot dehumidification to maintain the relative humidity of not more than 60%, Treasury Management staff should be twice a day to measure and record the relative humidity of the welding consumables library .
The Treasury shall not store items other than the welding consumables. Welding consumables should be stored on the shelf, not less than 300mm from the wall the distance from the ground, and should be classified palletizing, each pile type of grade, size, heat number. Inventory for a period not to damage the original packaging.
Treasury management staff should regularly check on stocks welding consumables, and check the results of the written record, so to match the account book, and found that due to improper preservation may affect the quality of welding defects, the material responsibility of engineers and relevant functional departments should be to reflect and timely manner.
4 Welding Electrode, flux drying and thermostats save
Welding consumables library should have enough welding rod, flux drying and constant temperature storage, drying box, electric heated box, box should have a reliable test temperature control, heat control and display devices.
Welding consumables database administrator should be based on the workshop pre-construction plan drying electrodes, flux, and its varieties, grades, specifications, quantities should the plan.
Welding consumables library administrators should be strictly in accordance with technical requirements drying and constant temperature storage bar, flux, and truthfully do a good job of welding consumables drying records. Welding consumables drying temperature, drying time, temperature Storage temperature should be consistent with the requirements. Drying welding rod should be to prevent the sudden cold polymerized first heat caused by welding rod skin cracking off. Does not allow the drying temperature and time requirements of different consumables with oven drying. Welding consumables in a drying box or incubator should grade, specification, heat number or mark transplantation logo to avoid confusion.
Welding consumables management should pay special attention to prevent the problem of welding consumables to absorb moisture. The factory of welding consumables are generally strict packaging, to reduce the intrusion of moisture in the air, but in addition to the tank sealed packaging, storage, there will be varying degrees of moisture absorption, seasonal line baking before use.
Welding materials of different varieties require different drying temperature and drying time, usually in the welding consumables instructions clearly defined, should be required to drying. Not more than two times the number of repeated baking electrode, and prepare the electrodes, flux drying records.
The issuance of five welding consumables and recycling
Welder with welding consumables requisitioned single welding consumables library to receive the welding consumables, recipients list should specify the recipients of welding consumables grades, specifications, quantities and product names used in welding, part number and welded joints No. recipients' collar with a date. Welding consumables library administrators should plan to check picking a single payment and fill welding consumables lot number on the requisition, the recipients time and payment of signature, fill in the welding consumables brought back records. Welding consumables requisitioned to be able to track and trace. Collar out of the electrode for more than four hours, should be returned to the re-drying, welding consumables should be returned to the electrode and the electrode head with leftover library, can not remain in the welding site or on the welder lounge, locker, toolbox, the electrode returned , consumables database administrator should be brought back records of welding consumables the requisitioned single and welding truthfully fill in the number of welding consumables returned. Recovered based upon the original grades, specifications, batch number, storage custody, must not be confused. Electrode recovery of the drug and skin flaking or other defects should be removed. Recycling flux screening to remove slag shell impurities and dust. Drying to join the re-use not less than 50% of the flux, and mixed.
Welding consumables library curators should make the record of the welding material payment account ".

D502 valve surfacing welding rod in line with GBEDCr-A1-03

Description: The D502 is titanium calcium type skin the 1Cr13 type valve surfacing electrode can be AC ​​and DC welding process. Surfacing metal 1Cr13 half

Ferritic high-chromium steel. Surfacing layer with air quenching properties, generally not to be heat-treated, uniform hardness, but also in the 750-800 ° C annealing softening, when added

Heated to 900-1000 ° C air-cooled or oil quenched, can be re-harden.

 Uses: This is a common surfacing electrode for surfacing operating temperature below 450 ℃, carbon steel or alloy steel shaft and valve

And so on.

D507 valve surfacing welding rod in line with GBEDCr-A1-15

Description: The D507 is a low hydrogen sodium type coating the 1Cr13 valve surfacing welding rod, using DCRP. Surfacing metal for the 1Cr13 half ferritic high-chromium steel.

Surfacing layer with air quenching properties, generally not to be heat-treated, uniform hardness, but also in the 750-800 ° C annealing soften when heated to 900-1000 ° C

Air-cooled or oil quenched, can be re-harden.

Uses: This is a common surfacing electrode for surfacing operating temperature below 450 ℃, carbon steel or alloy steel shaft and valve

And so on.

D507Mo valve surfacing welding rod in line with GBEDCr-A2-15

Description: The D507Mo the 1Cr13 valve low hydrogen sodium type coating surfacing electrode. Surfacing metal for the 1Cr13 half ferritic high-chromium steel. Surfacing layer has

Air quenching characteristics of the deposited metals with high temperature hardness, good thermal stability, erosion resistance. Such as the D577 Welding Electrodes used in conjunction to get a very

A good anti-abrasion performance. Surfacing process is simple, no preheating before welding without heat treatment after welding using DCRP.

 Purposes: to surfacing operating temperature below 510 ℃ temperature and high pressure cut-off valve sealing surface. Gate valve sealing surface should be of the electrodes and the D577 electrode with

Together (valve seat and disc, respectively, with more than two Nickel Electrode). D507MoNb valve surfacing welding rod in accordance with GBEDCr-A1-15

Description: D507MoNb low hydrogen sodium type coating the 1Cr13 type valve welding electrodes, the use of DCRP, by adding the appropriate amount of drug skin of Mo

Nb, strengthened and stable element, it is surfacing metal has good resistance to oxidation and anti-crack performance.

Uses: used for the operating temperature below 450 ℃, the low pressure valve sealing surface of the surfacing.

D512 valve surfacing electrode comply with GBEDCr-B-03

Description: The D512 is titanium calcium type skin the 2Cr13 type valve surfacing electrode, AC and DC welding process. Surfacing metal 2Cr13 Markov

Body of high-chromium steel. Surfacing layer has the characteristics of air quenching, generally without heat treatment, uniform hardness in the 750-800 ° C annealing softening when heated to

950-1000 ℃ air cooling or oil quenching can be re-harden.

Purposes: D512 is a versatile surfacing electrode surfacing layer than the D502 is harder and more wear-resistant and difficult to process for welding carbon steel or

Low alloy steel shaft, superheated steam valves, paddle mixer, screw conveyor blade.

D516MA valve surfacing electrode comply with GBEDCrMn-A-16

Description: D516MA is a low hydrogen potassium type coating of chromium-manganese steel surfacing electrode, the deposited metal has good wear resistance, heat resistance, corrosion resistance and thermal

Cracking performance welding process is simple, no preheating before welding without heat treatment after welding, surfacing layer for cutting.

Uses: Used for surfacing operating temperature below 450 ℃ by water, steam, oil media under the action of the parts, such as on the 25th cast steel, high pressure valves

Door seal surface.

D517 valve surfacing electrode comply with GBEDCr-B-15

Description: The D517 is a low hydrogen sodium type of drug skin the 2Cr13 type valve welding electrodes, the use of DCRP. Surfacing metal 2Cr13 martensitic high chromium steel.

Surfacing layer has the characteristics of air quenching, generally without heat treatment, uniform hardness in the 750-800 ° C annealing softening when heated to 950-1000 ° C empty

Cold or oil quenching can be re-harden.

Purposes: D517 is a versatile surfacing electrode surfacing layer than the D502 is harder and more wear-resistant and difficult to process for welding carbon steel or

Low alloy steel shaft, superheated steam valves, paddle mixer, screw conveyor blade.

D547 valve surfacing welding rod-comply with GBEDCrNi-A 15

Description: The D547 is a low hydrogen sodium type coating alloy steel core CrNiSi valve welding electrodes, DCRP. Deposited metals rely on silicon

Strengthened, with a certain ferrite austenite, has good resistance to abrasion, corrosion-resistant, anti-oxidation performance.

Purpose: to work following the surfacing of 570 ° C power plant high-pressure boiler installations the valve sealing surface and seal parts.

D547Mo valve surfacing electrode comply with GBEDCrNi-B-15

Description: D547Mo the low hydrogen sodium type coating CrNiSiMo valve surfacing electrode. The DCRP. The Surfacing metal has good high temperature anti-

Abrasion, erosion resistance performance, high temperature hardness and good thermal stability and resistance to fatigue. Surfacing metal aging hardening effect is remarkable, with

With the aging time increases, the hardness and scratch resistance performance to further improve.

Purposes: for the operating temperature below 600 ° C high pressure valve sealing surface of surfacing.

D557 valve surfacing electrode comply with GBEDCrNi-C-15

Description: The D557 is a low hydrogen sodium type coating CrNiSi valve surfacing electrode, deposited metal to rely on a large number of silicon enhanced, the austenite + Fe

The organization of the ferrite growth with the aging time, hardness and scratch resistance further improved performance, deposited metal has good resistance to corrosion, oxidation

Resistance and corrosion resistance, the use of DCRP.

Purposes: for the operating temperature below 600 ° C high pressure valve sealing surface of surfacing.

D577 valve surfacing electrode comply with GBEDCrMn-C-15

Description: The D577 is a low hydrogen sodium type coating, the Cr-Mn alloy steel core valve surfacing electrode. The DCRP surfacing metal for the high chromium and manganese Austria

Body's steel, so the effect of cold hardening significantly, with a good anti-abrasion performance, there is a certain temperature hardness, good thermal stability, such as

D507Mo used in conjunction with anti-abrasion performance, availability of good crack resistance of the electrode surfacing process is simple, the electrode may from time to preheat, postweld not

Heat treatment, the deposited metal cutting performance.

Uses: used for surfacing operating temperature below 510 ℃ temperature and high pressure valve sealing surface, such as in the gate valve used in conjunction with D507Mo use TING

Life higher.

Valve surfacing electrode for use:

Implementation of the GB984-2001 standard

Surfacing in the workpiece surface or edge of the cladding layer of wear, corrosion resistance, heat resistance and other properties of the metal layer welding process. Repair and improve

The life of the parts, the rational use of materials, improve product performance, reduce costs have significant economic benefits.

Surfacing work and working conditions are very complex, surfacing must be selected according to the different requirements of the appropriate electrode. Different workpiece and surfacing electrode

Different surfacing techniques in order to obtain satisfactory surfacing. The most commonly encountered problems in the surfacing is cracking, the main way to prevent cracking of the:

1, preheat temperature, the control layer, slow cooling after welding.

 2, post-weld stress relief heat treatment.

To avoid the multi-layer surfacing cracking low hydrogen type surfacing electrode.

4, when necessary, between the overlay and the base metal surfacing transition layer (low carbon equivalent, and high toughness electrodes).