Covered Electrodes For Hardfacing

Introduction of hard-faced wear-resistant welding materials-covered welding rod

 

1.Suggestions for welding material selection:

  AWS has relevant specifications for hard-faced welding materials, such as A5.13 hard-faced covered metal arc welding, A5.21 hard-faced bare welding wire and welding rod, to define materials. However, in general practical application, welding materials rarely define corresponding international specification class numbers. Therefore, in the selection of welding materials, the content of dissolved gold composition, hardness value and application occasions recommended by manufacturers are used as materials.

 

  This kind of material attaches great importance to the design of welding procedure, that is, what kind of welding material to use, preheating temperature, inter-track temperature, number of welding layers, whether to do post-heating, whether to do post-heat treatment, whether there is a transition layer and other important factors will determine the success or failure and service life of a hard-surface welding workpiece.

 

①For various environments with different working attributes, the recommended hard surface welding materials are as follows:

Workspace Properties

Hard-faced welding material category

Reference wear rate(%)


Reference hardness value (HRC)


High friction

High carbon-high chromium, high special alloys (W, Nb, V, Co, etc.)

0.05 ~ 0.2

50 ~ 75

Medium friction + medium impact

Semi-Austenite, Austenite + Artensite, Artensite, Pearlite

0.2 ~ 8.0

20 ~ 60

High impact

Austenite, high manganese steel, medium carbon low alloy steel

6.0 ~ 20.0

5 ~ 55

 

 

 

②According to the classification of each hard surface welding material according to the organization type, the recommended application occasions are as follows:

Welding method


Welding structure

Reference hardness

(HRC)


Application occasion

Covered weld

Charged wire

Submerged arc welding material

Pearlite 

iron  system

10~40

Couplers for gears, shafts, rolls, rolling mills, automatic coupling machines for vehicles, foot peripheral fittings of bulldozers and track head surfaces, etc.

SH-26RSH-35R

SH-45SH-45R

SFH-25GSFH-35GSFH-45GSFH-35-OSFH-41-O

SFH-17S*SF-80

Artensite 

iron series

35~65

Rollers or sprockets of bulldozers, idlers or track shoes, digging edges, rollers, bucket end edges, mixing blades, cutting tools and shells of dredgers, etc.

SH-50SH-50N4

SH-60SH-80系列、

SH-90

SFH-42MGSFH-58GSFH-59GSFH-63GSFH-51-OSFH-56-O

SFH-12S*SF-80

SFH-31S*SF-80

SFH-42S*SF-80

SFH-53S*SF-80

SFH-55S*SF-80

High manganese Austenite series

45~50

Blade or roller of crusher, hammer of crusher, claw of excavator and track frog

SH-MN

SFH-MNGSFH-MN-O

--

High carbon-high chromium system

55~68

Coal pulverizer, coal pulverizer rotor, sand pump shell and pump blade, ghost tooth, receiving tooth, blast furnace cover, grinder, etc.

SH-95HCSH-95HN

SFH-61GM

SFH-61NbGM

SFH-62GM

SFH-67NMG

SFH-61-OSFH-65-O

SFH-67-OSFH-70-O

--

Tungsten carbide system

58~65

Blades of bulldozers, lining tools, relieving teeth, cutting tools, concrete cutters and earth drills, etc.

SH-WSH-WM

SFH-66WG

--

Cobalt-chromium-tungsten alloy system

30~55

Bushing of high-pressure pump, moving wheel sleeve, sliding surface of high-pressure valve, turbine blade and various cutters, cutting edge for paper industry, valve seat ring of internal combustion engine, high-temperature and high-pressure valve, injection eye mold, etc.

Stellite weld

--

--

 

 

 

 

2.Key points of welding operation

(1)Storage management of welding rod

Suggestions for Carbon Steel Covered Welders.

 

(2)Precautions for welding


During the cooling process, high carbon-high chromium hard-faced welding materials are especially prone to weld bead cracking. In order to reduce the number of cracks and avoid weld bead peeling, preheating, wire temperature, post-heating control or transition layer as backing shall be carried out according to the manufacturer's recommendations.

 

②Most hard-faced welding materials have a certain amount of alloy. It is suggested to avoid high heat input during welding to reduce excessive burning loss of alloy and control the weaving amplitude within 3 times of the rod diameter.

 

The rest shall be in accordance with the recommendations of carbon steel coated welders.

 

View:

SH-50

硬面耐磨用SMAW銲接
AWS --
JIS --
EN --
GB --

SH-50N4

硬面耐磨用SMAW銲接
AWS --
JIS --
EN --
GB --

SH-58HC

硬面耐磨用SMAW銲接
AWS --
JIS --
EN --
GB --

SH-60

硬面耐磨用SMAW銲接
AWS --
JIS --
EN --
GB --

SH-80W

硬面耐磨用SMAW銲接
AWS --
JIS --
EN --
GB --

SH-80B

硬面耐磨用SMAW銲接
AWS --
JIS --
EN --
GB --

SH-WM

硬面耐磨用SMAW銲接
AWS --
JIS --
EN --
GB --

SH-26R

硬面耐磨用SMAW銲接
AWS --
JIS --
EN --
GB --

SH-35R

硬面耐磨用SMAW銲接
AWS --
JIS --
EN --
GB --

SH-45

硬面耐磨用SMAW銲接
AWS --
JIS --
EN --
GB --

SH-45R

硬面耐磨用SMAW銲接
AWS --
JIS --
EN --
GB --

SH-80R

硬面耐磨用SMAW銲接
AWS --
JIS --
EN --
GB --

SH-90

硬面耐磨用SMAW銲接
AWS --
JIS --
EN --
GB --

SH-90HS

硬面耐磨用SMAW銲接
AWS --
JIS --
EN --
GB --

SH-95HC

硬面耐磨用SMAW銲接
AWS --
JIS --
EN --
GB --

SH-95HN

硬面耐磨用SMAW銲接
AWS --
JIS --
EN --
GB --

SH-MN

硬面耐磨用SMAW銲接
AWS A5.13 EFeMn-A
JIS --
EN --
GB --

SH-80

硬面耐磨用SMAW銲接
AWS --
JIS --
EN --
GB --

SH-W

硬面耐磨用SMAW銲接
AWS --
JIS --
EN --
GB --