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Welding technology of submerged-arc welding of X-shaped groove of medium plate

A welding process and submerged arc welding technology, which is applied in the field of X-shaped groove submerged arc welding of medium and heavy plates, can solve the problems of long welding time, difficult grinding, and welding seam pores, so as to reduce welding man-hours and solve welding methods. , the effect of saving welding materials

Active Publication Date: 2013-04-10
HUNAN VALIN XIANGTAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Generally, submerged arc welding machines, gas shielded welding machines and DC welding machines are required. The process is complex and the welding time is long. It is difficult to grind the carbon arc gouging. Pores are generated inside, which affects the qualified rate of weld flaw detection

Method used

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  • Welding technology of submerged-arc welding of X-shaped groove of medium plate
  • Welding technology of submerged-arc welding of X-shaped groove of medium plate
  • Welding technology of submerged-arc welding of X-shaped groove of medium plate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0010] Example 1: Submerged arc welding of 100mm E36 steel plate

[0011] Welding test plate set pair such as figure 1 , welding process parameters are shown in Table 1.

[0012] Table 1 Welding process parameters of 100mm E36 steel plate submerged arc welding test

[0013]

[0014] Through the submerged arc welding test on the E36 steel plate with a thickness of 100mm, the welded joints of E36 steel have good tensile properties, bending properties and low-temperature impact properties, and the welded joints have excellent performance.

Embodiment 2

[0015] Embodiment 2: Submerged arc welding of 40mm Q370qE steel plate.

[0016] Welding test plate set pair such as figure 2 , the weld pattern is as image 3 , welding process parameters are shown in Table 2.

[0017] Table 2 Welding test parameters of 40mm Q370qE steel plate submerged arc welding

[0018]

[0019] The submerged arc welding test of the Q370qE+TM steel plate shows that the Q370qE+TM steel plate is welded under the condition of heat input of 35kJ / cm, and the tensile properties, bending properties and impact properties of the welded joint are good, which meets the standard requirements.

Embodiment 3

[0020] Embodiment 3: Submerged arc welding of 40mm NM360 steel plate.

[0021] Welding test plate set pair such as Figure 4 , the detailed welding process parameters are shown in Table 3, the preheating temperature is 100 ℃, and the interlayer temperature is ≤200 ℃.

[0022] Table 3 Welding test parameters of 40mm NM360 steel plate submerged arc welding

[0023]

[0024] Through the submerged arc welding test of NM360 steel plate, the results show that under the condition of NM360 steel plate with heat input of 30kJ / cm, NM360 steel and Q550D, Q690D dissimilar steel are welded with corresponding strength level welding wire, and the tensile properties and impact properties of the welded joint are good. , Excellent performance of welded joints.

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Abstract

The invention discloses a welding technology of submerged-arc welding of an X-shaped groove of a medium plate, which adopts the following technological steps: (1) when the front surface is welded: the welding current is 450 to 480A; the welding voltage is 25 to 26V; the welding speed is 54 to 58cm / min; and the rod extends by 30 to 35cm; (2) and when the back surface is welded: the welding currentis 600 to 640A; the welding voltage is 30 to 32V; the welding speed is 44 to 47cm / min; and the rod extends by 35 to 40cm. The welding technology has the advantages that the submerged-arc welding is directly adopted for priming; the back chipping is not required on the back surface of a welding seam; the appropriate welding current and voltage is selected and the welding speed is reasonably matched; the problem on the complicated welding method in the prior art is solved; the qualification rate of the welding seam flaw detection is simultaneously guaranteed; the working time of the welding is reduced; and the welding material is saved.

Description

Technical field [0001] The invention belongs to the welding technology, in particular to an X-shaped groove submerged arc welding process for medium and thick plates. Background technique [0002] The existing welding technology of X-shaped groove submerged arc welding of medium and thick plates generally adopts gas shielded welding or manual arc welding for backing, and carbon arc gouging for root cleaning on the back of the weld seam. Generally, submerged arc welding machines, gas shielded welding machines and DC welding machines are required. The process is complex and the welding time is long. It is difficult to grind the carbon arc gouging. Pores are generated inside, which affects the pass rate of weld flaw detection. Contents of the invention [0003] The invention aims to provide a submerged arc welding process for X-shaped grooves of medium and thick plates, which only uses the submerged arc welding process without carbon arc gouging to ensure the quality of weld...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K9/095B23K9/18
Inventor 艾爱国邱福祥欧勇罗松云肖大恒
Owner HUNAN VALIN XIANGTAN IRON & STEEL CO LTD
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