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Welding process for stainless steel clad plate

 


1.Use of
This process is suitable for a variety of stainless steel composite, low-carbon steel or low alloy steel as the substrate thickness is greater than or equal to 4mm stainless steel clad plate welding.
2.1Welding material selection principles
2.1.1 Stratified material selection should ensure that the deposited metal alloy element content of not less than the lower limit of the stratified material standards.
2.1.2 Transition layer of the electrode should choose the 25% Cr-13% Ni-type or 25% Cr-20% Ni type to complement the primary dilution stratified complex layer containing molybdenum stainless steel composite panels, should be 25% -13% Ni-Mo electrode.
2.2 Commonly used in stainless steel clad plate welding material can be Table 2.2-1,2.2-2 selected.
Table 2.2-1 commonly used stainless steel composite plate transition layer and multiple layer welding material selection

 


Stratified material

Transition layer welding

Stratified welding

Electrode grades

Electrode Model

Electrode grades

Electrode Model

Wire steel

0Cr18Ni9
(304)

A302
A307
A062
A402
A407

E309-16
E309-15
E309L-16
E310-16
E310-15

A102
A107

E308-16
E308-15

H0Cr21Ni10

00Cr19Ni10
(304L)

A062

E309L-16

A002

E308L-16

H00Cr21Ni10

0Cr18Ni9Ti
(321)
1Cr18Ni9Ti

A302
A307
A062
A402
A407

E309-16
E309-15
E309L-16
E310-16
E310-15

A132
A137

E347-16
E347-15

H0Cr20Ni10Ti
H0Cr20Ni10Nb

00Cr17Ni14Mo2
(316L)

A042

E309MoL-16

A022

E316L-16

H0Cr19Ni12Mo2

0Cr17Ni12Mo2
(316)

A312
A042

E309Mo-16
E309MoL-16

A022

E316-16

H00Cr19Ni12Mo2

1Cr13
(410)

A302
A307
A402
A407

E309-16
E309-15
E310-16
E310-15

A302
A102

E309-16
E308-16

H0Cr14

 

Table 2.2-2 commonly used stainless steel clad plate grass-roots welding material selection


Grass-roots material

Manual arc welding

Submerged arc welding

Argon arc

CO2 gas shielded welding

Welding rod

Wire steel

Welding flux

Wire steel

Wire steel

Model

Trademark

Model

Trademark

Q235A、Q235B、20g、20R

E4303
E4315

J422
J427

H08A
H08MnA

HJ401-H08A
HJ401-H08MnA

HJ431

H08Mn2SiA

H08Mn2SiA

16Mn

E5015

J507

H08MnA
H10Mn2
H10MnSi

HJ401-H08MnA
HJ401-H10Mn2
HJ401-H10MnSi

HJ431

H08Mn2SiA

H08Mn2SiA

16MnR

E5015
E5015-G

J507
J507R

 

1.Preparation before welding
3.1 Cutting
Cutting and beveling of stainless steel composite plate as far as possible the method of machining, the cutting surface should be smooth, the use of cutting shears, double layer should be facing up. Can also be used for plasma cutting, cutting stratified upward, prohibited the cutting slag falls stratified.
3.2 Processing and inspection of the groove
1.Form and size of the groove by drawing the design requirements, such as the design is not clearly defined, and may refer to Figure 3.2-1 selection.
2.Groove selection principles: to ensure that the quality of welding filler metal fusion than the small, easy to operate.
3.The groove processing is generally made ​​of mechanical methods. Plasma cutting, gas cutting and other methods to open the system groove, you must remove the oxide layer of the composite surface
d. The groove processing after visual inspection, no cracks and layered, otherwise it should be repaired.
3.3Weld before the clean-up
Mechanical means within the groove each side of 20mm range and organic solvents for surface cleaning to remove surface oil, rust, metal shavings, the oxide film and other dirt, splash paint from the groove of the stratified 100mm range should be painted.
3.4 Weldment assembly
a.Assembly should be stratified for the baseline, the wrong side should not be greater than half of the thickness of the stratified, no larger than 2mm, take the wrong side of the volume for the complex thickness, the smaller the thickness of the stratified
b.Tack welding should be welded on the primary parent material, and using the same welding materials and welding the base metal.

Manual arc welding positioning weld Refer to Table 3.5-1

Weldment thickness

Weld thickness

Weld length

Spacing

≤20

≤0.7δ0

>30

Not more than 500

>20

Not less than 8

>50

δ0Thickness of Base

 

(c) in the assembly process is strictly forbidden welders stratified fixtures, tools and clamps should be welded at the grassroots side.
(d) the stratified side of the attachment welding to meet the requirements of design drawings, design requirements stratified measured attachment weld metal at the grass-roots level should be stratified first part of the peel, the use of the transition layer electrode welding stainless steel bracket at the grassroots level shell body, the weld surface welding stratified electrode welding.
Welding
When the product technical conditions for the welding procedure qualification required by the construction unit in the pre-construction based on the structural characteristics of the product and technical requirements to develop welding procedure qualification, and have achieved the recognition of the quality supervision department.
4.1 welding method
The primary welding manual arc welding, submerged arc, and carbon dioxide gas shielded arc welding is recommended. Stratified and over-layer welding, gas tungsten arc welding and manual arc welding, can be applied to other welding methods to ensure the welding quality.
4.2 welding procedures
Welding welding are advised to grass-roots, and then welding the transition layer, and finally welded stratified (as shown in Figure 4.2-1). When conditions are restricted, the first welding clad welding of buffer layer and grass-roots level, in this case, if the thickness of the composite plate is less than 10mm, the welding of the grass-roots level can be directly used with the same buffer layer of welding materials, if the composite plate thickness greater than 10mm, this time may be appropriate to increase the welding thickness of the buffer layer (buffer layer thickness of the welding should be greater than or equal to 5mm), the final carbon or low alloy welding the grassroots level.

 

 

Welding at the grass-roots level
Welding the primary weld shall not be touched and melted composites, the first welding substrate, the root of the weld bead or surface composite interface should be from the 1-2mm. The weld reinforcement shall comply with the provisions of the relevant standard. As the substrate thickness, steel, and structural factors can be used, if necessary, appropriate warm-up.
Transition layer welding
When welding the transition layer to ensure good fusion under the premise of minimizing the melting of the substrate metal into lower fusion ratio. This should be a welding rod or wire of smaller diameter and smaller welding energy. The thickness of the transition layer should be not less than 2mm.
Complex layer of welding
Welding stratified, pay attention to protect the surface of stratified to prevent weld spatter damage the surface of stratified, not the surface of stratified random arc welding Karan, rings and falsework. Clad weld surface as far as possible remain flat with the surface of the stratified fairing. Butt weld reinforcement not more than 1.5mm
5, post weld heat treatment
5.1 post-weld heat treatment according to the design implementation.
5.2 containers manufactured with stainless steel clad plate, pipe or components, when the need for post-weld heat treatment is recommended before in the welding of buffer layer according to the grassroots level requires heat treatment heating temperature. Commonly used stainless steel clad plate weld heat treatment parameters are shown in Table 4.3.2-1.
Table 4.3.2-1 commonly used stainless steel clad plate weld heat treatment parameters


Stratified material

Base material

Heating temperature(℃)

Constant time
(h)

Heating rate
(℃/ h)

Cooling rate
(℃/ h)

Ferrite system
Markov system
Austenitic

Q235A、Q235B
20g、20R、16Mn、16MnR

580~620

T/25,And not less than1/4

Above 400 ℃, the heating rate should not exceed 5000 / T ° C / h and shall not exceed 200 ℃ / h, not less than 50 ° C / h

Shall not exceed 6500 / T ° C / h, and shall not exceed 260 ° C / h, not less than 50 ° C / h, and natural cooling below 400 ℃

12CrMo

600~680

Note: T is the total thickness (mm) of stainless steel clad plate.

 

5.3 corrosion resistance requirements of the container of stainless steel clad plate welded pipes, clad weld surface passivation pickling.
6, welding quality inspection
Components of stainless steel clad plate welding quality test items generally includes visual inspection, nondestructive testing, mechanical test, pressure test, intergranular corrosion tendency tests and metallographic examination, the test items of each product should be product design drawings and technical conditions regulations.
6.1 Appearance inspection
(a) weld shape, size should meet the design requirements.
(b) the surface of the weld and heat affected zone may not have pores, slag inclusions, cracks, craters and other defects.
(c) when no express provision in the product design drawings and technical conditions, the grass-roots side of the weld depth of undercut shall not be greater than 0.5mm, the length of the undercut shall not be greater than 10% of the total length of the weld, and shall not be greater than 100mm. Stratified side shall not be undercut defects.
6.2 product technical conditions for the welding procedure qualification, or requirement to provide performance and technical requirements of product welding test plate, but also for mechanical testing, nondestructive testing of welds, metallographic examination.
7, rework
When found that welded joints are not allowed in the defect, the defect should be clear clean, according to relevant repair process requirements for repair.