Welding Instruction

Welding Instruction


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Welding Equipment

BoMyung Metal Co., Ltd.

Country / Year Established
South Korea South Korea /
Business type
Others
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Product name Welding Instruction Certification -
Category Welding Equipment Ingredients -
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origin Stock -
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Product Information

Filler metal

The filler wire or rod has a grade identical to that of the parent metal.
However, the filler wire or rod used for weld Cu-Ni 90/10 with Cu-Ni 70/30 bare metal available.
Flux coated electrodes can be used for wall thickness of 6mm above.
Cu-Ni 70/30 can be welded with Cu-Ni 70/30 filler metal.
It is important to degrease of parent metal filler metal.

Table 1. is showing national specification of the filler metal.

National Cu-Ni 90/10 Cu-Ni 70/30
Flux coated electrode Filler wire Flux coated electrode Filler wire
Germany DIN 1733
S-CuNi10Fe
No.2.0873
DIN 1733
S-CuNi10Fe
No.2.0873
DIN 1733
S-CuNi30Fe
No.2.0873
DIN 1733
S-CuNi30Fe
No.2.0873
British   BS 2901
Part.3 Type C16
90/10 Cu-Ni-Fe-Ti
  BS 2901
Part.3 Type C18
90/10 Cu-Ni-Fe-Ti
USA     AWS A 5.6 E CuNi AwS A 5.7 ER CuNi

Edge preparation for butt welded joints

Joint Preparation on pipes ( End beveling to welding) can be used to all types. Generally, edge preparation is the same fig.1.
Welding operation can be carried out under conditions if jointing parts are perfectly clean and free greas, oxidation and dust.
If possible, welding is carried out in down-hand position with "1G"

Internal Protection

To avoid oxidation and fluxing on the inside of the joint, it is required to ensure internal protection by shielding gas (pure 99.9% argon) which is used as the back purging gas (pure 99.9% argon or nitrogen)

Tacking

The parts to be joined together are edge to edge and tacked. The tack weld should be kept to a minimum and as short as possible and should be deposited, cleaned thoroughly before welding commences.
Positional welding is facilities by making the root run by the TIG process. Then, travel is reversed and welding continued with a weave motion.
The diameter of the electrode is individual on the welding current. The following table showing the typical data

Metal thickness (mm) Diameter of electrode (mm) Diameter of filler wire (mm) Welding current (Ampere) Argon flow (L/mm) Number of pass
2 1.6 2 100 ~ 120 7 1
3 2.4 2 140 ~ 160 8 2
4 3.2 3.2 ~ 5.0 180 ~ 200 8 2
6 3.2 3.2 ~ 5.0 220 ~ 260 8 3
8 3.2 3.2 ~ 5.0 220 ~ 260 8 4
10 3.2 3.2 ~ 5.0 220 ~ 260 8 5

The number of pass is necessary to follow table. 2 in order to avoid local overheating which risks causing collapse of the bead.
* Detailed welding procedure specification is available upon request.

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BoMyung Metal Co., Ltd.

Country / Year Established
South Korea South Korea /
Business type
Others

12

TRADE TOWER

DUNS

President
HONG, SU SIK
Address
584-9 Hwajeon-dong, Gangseo-gu, Busan, Korea
Product Category
Copper Alloy & Profiles,Other Copper
No. of Total Employees
1-50
Company introduction

BoMyung has been supplying various Copper & Copper-Alloys materials as a specialized manufacturer of PIPE, Fittings & Flanges to shipbuilding, fresh water facilities, plant, petrochemistry and various construction for over 18 years.
 
Since established in 1994, we have been doing our best for customer's satisfaction and value creation. Also, we have been improving our products for competitive price and high quality.

We BoMyung is willing to take a role in domestic and international industrial development as well as in improving the quality of your life by improving the standard of living and protecting our natural environment.

We are always ready to serve you with all your Copper & Copper-Alloys metals needs. That can be of mutual benefit. It is sure BoMyung will be an ideal partner.

Main Markets

China China

India India

South Korea South Korea

U.S.A U.S.A

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