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NIHONWELD N-7018AC
AWS Specification: AWS A5.1 E7018 H16
JIS Specification:
Other Specification:

I. APPLICATIONS:

The primary application is for low hydrogen welding where DC power is not available. Normally difficult AC tack welding presents no problem for this rod and is highly recommended for use.

II. DESCRIPTION:

N-7018AC is a unique electrode specifically designed for exceptional performance when using alternating current. Unlike conventional 7018 electrodes, N-7018AC offers smooth, stable arc on AC current and is capable of cold restrike. Bead contour is excellent, spatter is slight, and slag is often self-cleaning. Performance is also good with low open circuit voltage power sources.

III.  NOTES ON USAGE:

  • As short an arc as possible should be kept at all times. A slight weave may be used to control the size and shape of the weld deposit. On multi-pass welds, all slag should be removed between passes. The electrode is usually tilted slightly in the direction of travel.

  • Down hand.....Flat position welds should be made on the high end of the recommended current range for each electrode size to insure good “wash up” on the sides. A weave of 2 ½ times the electrode diameter may be used. On larger size grooves several stringer beads should be used in preference to one large weave bead.

  • Vertical.....The root pass should be made with a straight upward progression, a short arc, the electrode tilted slightly in the direction of travel. The electrode must not be “whipped” or manipulated in any way to increase arc length. Some weldors prefer to use a “V” shape motion for vertical up root passes. The electrode should hesitate at the point of the “V” in the root of the joint to assure penetration and dig out slag. Each leg of the “V” should be about 1/8 inch. It should be reiterated, no “whipping” should be done. On larger size vertical welds the second and subsequent passes should be made up weaving across the face of the root bead, continuously building up a shelf. The weave should pause at the sides of the first pass to wash against the base metal and clear out trapped slag.

  • Overhead.....Stringer beads are recommended for all overhead welding. Overhead fillets should be made with the electrode at an angle of 30° to the vertical leg.

  • Horizontal....Horizontal fillets should be made with stringer beads, with the electrode directed into the joint at a 45° angle. Stringer beads should also be used for multi-pass welds.

?IV. TYPICAL CHEMICAL COMPOSITION OF ALL-WELD METAL DEPOSITS (%):

 

C

Mn

Si

P

S

Diffusible Hydrogen

mL/100g weld metal

0.06

1.40

0.40

0.013

0.018

8

V. TYPICAL MECHANICAL PROPERTIES OF WELD METAL:

 

Yield Point

N/mm2 (ksi)

Tensile Strength

N/mm2 (ksi)

Elongation

%

Impact Value

°C, J (°F, Ft-Lbs)

564 (78)

651 (90)

27

-29°, 48 (-20°, 35)

VI. WELDING POSITIONS: ALL POSITIONS EXCEPT VERTICAL DOWN

 

VII. SIZES & RECOMMENDED CURRENT RANGE:

 

SIZES

(mm)

Dia. (mm.)

2.6

3.2

4.0

Length (mm.)

350

350

350

Current Amp.

75-120

105-150

130-200

TEST RESULT

The information contained or otherwise referenced herein is presented only as “typical” without guarantee or warranty, and Industrial Welding Corporation expressly disclaims any liability incurred from any reliance thereon. Typical data and Test results for mechanical properties, deposit or electrode composition and diffusible hydrogen levels were obtained from a weld produced and tested according to prescribed standards, and should not be assumed to be the expected results in a particular application or weldment. Actual results will vary depending on many factors, including, but not limited to, weld procedure, plate chemistry and temperature, weldment design and fabrication methods. Users are cautioned to confirm by qualification testing, or other appropriate means, the suitability of any welding consumable and procedure before use in the intended application.