Welding method for single-sided welding and double-sided forming of stainless steel
A single-sided welding double-sided, welding method technology, applied in the field of steel welding, can solve the problem of high cost, achieve the effects of beautiful shape, wide application range, high impact toughness reserve and safety margin
Active Publication Date: 2016-02-03
WUHAN YIYE STEEL STRUCTURE
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Problems solved by technology
If the two-person synchronous argon arc welding process can reduce deformation and avoid root cleaning, the cost of equipment, labor, and gas and other auxiliary materials invested in the welding process will be too high
Method used
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Embodiment 1
[0025] This embodiment provides a welding method for single-sided welding and double-sided forming of S30408 stainless steel, the method comprising the following steps:
[0026] 1) The groove adopts a unilateral V-shaped groove, the groove angle is 60°, and the groove gap is 4mm; the back of the groove adopts a ceramic liner 1;
[0027] 2) The front of the groove is made of argon arc welding with self-shielding argon arc welding wire with coating, and then the cover is filled by electrode arc welding; the welding process parameters of argon arc welding are welding current 125-130A, arc voltage 12-14V , welding speed 14cm / min, welding heat input 8KJ / cm; the technological parameters of described electrode arc welding are welding current 150~160A, arc voltage 22~24V, welding speed 8cm / min, welding heat input 25KJ / cm, The electrode baking system is 350℃×2h.
[0028] The electrode type used in the step 2) is E308L-16, and its composition is as follows: C≤0.04%, Si≤0.9%, 0.5%≤Mn≤...
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Abstract
The invention provides a welding method for stainless steel one-side welding double-side forming. The welding method includes steps that 1) a stainless steel groove is a one-side V-shaped groove, groove angle is 60 degrees, and a groove gap is 4mm; a ceramic liner is attached on the back of the groove; 2) the front side of the groove is bottomed by self-protection argon arc welding wires with coating through argon arc welding and the cover surface is filled by shielded metal arc welding; the technical parameters of the argon arc welding include 125-130A welding current, 12-14V arc voltage, 14cm / min welding speed and 8KJ / cm welding heat input; the technical parameters of the shielded metal arc welding include 150-160A welding current, 22-24V arc voltage, 8cm / min welding speed, 25KJ / cm welding heat input and 350 DEG CX2h shielded metal roasting system. The back of welding joints is good in forming, and various areas of the welding joints have high impact toughness storage and safety richness degree.
Description
technical field [0001] The invention relates to the field of iron and steel welding, in particular to a welding method for single-side welding and double-side forming of stainless steel. Background technique [0002] S30408 austenitic stainless steel has comprehensive and good comprehensive properties, and has been widely used in various industries, especially in the construction of low-temperature cryogenic LNG storage tanks in recent years. [0003] S30408 stainless steel has a small thermal conductivity and a large thermal expansion coefficient. A large amount of input during the welding process will easily lead to welding deformation and large internal stress at the joint; when the weld stays at 400-485°C for too long, it is easy to cause Cr and C Reaction, resulting in poor Cr, the formation of intergranular corrosion. The traditional welding method is electrode arc welding. After the front side is welded, carbon arc gouging is used on the back side to clean the ro...
Claims
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IPC IPC(8): B23K9/00B23K9/16B23K33/00B23K35/30
CPCB23K9/0017B23K9/02B23K9/173B23K9/23B23K33/00B23K35/308B23K2103/04
Inventor 潘伍覃黄金祥宋朝文肖涛涛韩东波
Owner WUHAN YIYE STEEL STRUCTURE