Shielded metal arc welding method used for phase welding of X7Ni9 steel and S30408 steel

An electrode arc welding and electrode technology, which is applied in arc welding equipment, welding/welding/cutting items, welding medium, etc., can solve the problems of complex joint structure and difficulty, achieve high strength, good low temperature toughness, and avoid excessive internal stress. concentrated effect

Active Publication Date: 2016-01-27
WUHAN YIYE STEEL STRUCTURE
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Problems solved by technology

Dissimilar steel welded joints need to take into account the characteristics of different base materials on both sides, while dissimilar steel is affected by the chemical composition, thermal expansion coefficient, and diffusion of alloy elements, especially carbon elements, of the two materials. Makes the welding of dissimilar steels more difficult than the welding of the same kind of steel

Method used

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  • Shielded metal arc welding method used for phase welding of X7Ni9 steel and S30408 steel
  • Shielded metal arc welding method used for phase welding of X7Ni9 steel and S30408 steel
  • Shielded metal arc welding method used for phase welding of X7Ni9 steel and S30408 steel

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Embodiment 1

[0029] The present embodiment provides a kind of electrode arc welding method that is used for X7Ni9 steel and S30408 ​​steel phase welding, and this method comprises the following steps:

[0030] 1) The electrode arc welding groove adopts a unilateral V-shaped groove, the front groove angle is 65°, and the groove gap is 1mm; the electrode type used is ENiCrFe-9, and its composition is as follows: C: 0.08%, Si: 0.23%, Mn: 2.2%, P: 0.007%, S: 0.003%, Cr: 16.7%, Ni: 63.3%, Mo: 5.3%, Nb: 1.2%, Cu: 0.02%, Fe: 9.9%, W: 0.7%.

[0031] 2) Dry the moisture on the surface of the X7Ni9 and S30408 ​​steel plates with a flame, and the temperature of the steel plates before welding is 28°C;

[0032] 3) Welding process parameters: the first backing welding current is 90A, the arc voltage is 20V, the welding heat input of the backing welding is 6KJ / cm; the subsequent filling welding welding current is 135A, the arc voltage is 25, the welding speed is 8cm / min, and 25.3KJ / cm, the electrode ...

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Abstract

The invention provides a shielded metal arc welding method used for phase welding of X7Ni9 steel and S30408 steel. The shielded metal arc welding method comprises the following steps that (1) a V-shaped groove or an asymmetric X-shaped groove is adopted as a shielded metal arc welding groove; (2) the two sides of a weld joint of an X7Ni9 steel plate and an S30408 steel plate is kept in a dry state before welding; (3) an alternating current power source is adopted, and suitable welding process parameters are selected; (4) the interpass temperature is kept to be smaller than 90 DEG C, after first layer of base is welded, the weld joint is polished and cleaned, then fine cracks are detected through permeation and eliminated through a polishing method, and afterwards, filling welding is conducted; and (5) after one side is welded, the reverse side needs to be subjected to back gouging and be polished, and similarly, fine cracks are detected through permeation and eliminated through polishing. According to the shielded metal arc welding method, the properties of the two steel are both taken into account fully, so that the quality of a high-strength dissimilar steel welded joint is effectively ensured. Above all, no stress relief treatment is needed after welding, and the high toughness of the welded joint at the temperature of -196 DEG C can be still ensured.

Description

technical field [0001] The invention relates to the field of iron and steel welding, in particular to an electrode arc welding method for welding low-temperature high-strength tempered steel X7Ni9 steel and S30408 ​​austenitic stainless steel dissimilar steel. Background technique [0002] X7Ni9 is a low-temperature nickel steel with good high-strength and low-temperature properties. It is the preferred material for building large-scale low-temperature storage tanks, such as liquefied natural gas (LNG) storage tanks. X7Ni9 steel plates are usually delivered in a quenched and tempered state. When the parts of the LNG storage tank are made of austenitic stainless steel, the engineering application puts forward the requirements for the welding of X7Ni9 and S30408 ​​austenitic stainless steel. [0003] Both X7Ni9 and S30408 ​​have good low-temperature performance at -196°C. When choosing iron-nickel-based welding consumables or austenitic stainless steel welding consumables as t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K35/30B23K9/02B23K9/235
CPCB23K9/02B23K9/235B23K35/304B23K2103/18
Inventor 黄金祥胡金涛韩东波潘伍覃杨国强
Owner WUHAN YIYE STEEL STRUCTURE
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