Solid Wires For Nickel Alloy

Introduction to nickel-based alloy steel welding materialssolid welding wire

 

1.Suggestions for welding material selection:

According to AWS A5.14 "Specification for Nickel and Nickel Alloy Bare Welding Wire and Welding Rod", the classification is based on the main components of dissolved gold. The information of tensile strength grade will not be displayed on the specification. GMAW and GTAW welding methods are specified in this chapter. The relevant classification and application are summarized as follows:

 

Specification Class Number

Characteristic or application

ERNi-1

It is mainly used for welding pure nickel workpieces for industrial use. Due to the addition of titanium (Ti), it can prevent the generation of weld bead pores. It is generally matched with ASTM B160, B161, B162, B163.

ERNiCu-X系列

It is mainly divided into ERNiCu-7 welding for nickel-copper base metal, such as: ASTM B127, B163, B164, B165; Another specification is ERNiCu-8 for welding of age-hardening nickel-copper base metal, such as ASTM F467, F468.

ERNiCr-X系列

This series includes 4 welding material grades,-3 and-4 and-6 and-7. Most of them are used for nickel-chromium or nickel-chromium-iron alloy base metals, such as ASTM B163, B166, B167 and B168.

ERNiCrFe-X系列

This series includes 9 welding material grades,-5 and-6 and-7 and-7A and-8 and-11 and-12 and-13 and-14. Most of them are used for nickel-chromium or nickel-chromium iron alloy base metals, such as ASTM B163, B166, B167, B168. The more special grades are:-6 and-8 can be used for age hardening treatment,-7A and-13 can resist low plastic cracking (DDC) and oxide pollution,-11 can be used in high temperature environment, and-14 can especially resist low plastic cracking (DDC). Usually combined with SAW welding method.

ERNiFeCr-X系列

Application of ERNiFeCr-1 in ASTM B423 Welding; ERNiFeCr-2 can be used for age hardening treatment and welded with ASTM B637 and AMS 5589 materials.

ERNiCrFeSi-1

Generally welded with ASTM B163, B166, B167, B168, B366, B516, B517, B546, B564 materials.

ERNiCrFeAl-1

This welding material is usually used in petrochemical industry and can resist metal dusting, carbonization, vulcanization and high temperature corrosion. It is usually welded with ASTM B166, B167 and B168 materials.

ERNiMo-X系列

There are 9 welding material grades in this series,-1 and-2 and-3 and-7 and-8 and-9 and-10 and-11 and-12. The more special grades are:-3 is used for nickel-based, cobalt-based and iron-based alloy welding and different materials welding,-8 and-9 is usually used for 9% Ni steel welding,-10 and-11 and-12 is usually used for ASTM B333, B335, B366, B564, B619, B622, B626 material welding or different materials welding.

ERNiCrMo-X系列

There are 19 welding material grades in this series,-1 and-2 and-3 and-4 and-7 and-9 and-10 and-11 and-13 and-14 and-15 and-16 and-17 and-18 and-19 and-20 and-21 and-22.

The more special grades are:

-3 is used for working temperature from low temperature to 540 ℃, and is usually welded with ASTM B443, B444 and B446 materials.

-4 is usually welded with ASTM B574, B575, B619, B622, B628 materials.

-15 can be used for age hardening treatment and welded with ASTM B 805 material.

-16 is commonly used in anti-corrosion heap welding, especially effective against crevice corrosion.

-17 and-18 are commonly used for welding ASTM B574, B575, B619, B622, B629 materials, especially for welding different materials of super Vosten stainless steel.

-20 is especially suitable for welding super dual-phase steel and has excellent low temperature toughness.


ERNiCrCoMo-1

Suitable for welding Ni-Cr-Co-Mo alloy ASTM B166 (UNS N06617)

ERNiCoCrSi-1

It is suitable for welding Ni-Cr-Co-Si alloy ASTM B435, B572, B619, B626 materials. This material will be more sensitive to iron metals. It is not recommended to weld with iron-based alloys.

ERNiCrWMo-1

Suitable for welding Ni-Cr-W-Mo-La alloy ASTM B366, B435, B564, B572 alloy.

 

 

 

2.Key points of welding operation

(1) Storage management of welding wire


Please refer to the description of carbon steel solid welded wire for storage management.

 

(2) Precautions for welding


Please refer to the contents of nickel-based covered weld for cleaning and temperature management.

 

In GMAW welding method, 100% Ar or 80 ~ 85% Ar + 15 ~ 20% He mixture is used as shielding gas to form an arc mode of arc spraying and moving, and the gas flow rate is set at 15 ~ 20 l/min. If the mixed gas mode with He is matched, the arc force is strong, so attention should be paid to the matching of welding conditions to avoid welding corrosion.

 

In GTAW welding method, 100% Ar is mostly used as shielding gas, and 100% He or Ar + He mixture is also used. Welding condition is 60 ~ 100A, shielding gas is 8 ~ 15 l/min; The welding condition is 100 ~ 150A, and the shielding gas is set at 12 ~ 20 l/min.

 

 In GTAW welding method, because nickel-based welding materials are all of high alloy composition, the fluidity of molten iron and arc permeability will be poor. Attention should be paid to the gap of full permeability in the bottom track and the root of the slotted surface to avoid the phenomenon of poor permeability.

 

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