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Steel material Welding Problem

Source: Time:2016-01-19 08:56:57 浏览次数:

Welding is a method of connecting steel works, because some parts of the node is no longer processing plant complete, so construction site steel weld quality control is essential to do before the welding auxiliary soldering tools , site and other links that may affect the weld quality, weld joint often avoid defects in quality. Wang Ye Steel Xiaobian to share your steel welding engineering 9 most common quality problems, to be a reference.

Welding is a method of connecting steel works, because some parts of the node is no longer processing plant complete, so construction site steel weld quality control is essential to do before the welding auxiliary soldering tools , site and other links that may affect the weld quality, weld joint often avoid defects in quality. Wang Ye Steel Xiaobian to share your steel welding engineering 9 most common quality problems, to be a reference.

焊缝变形.jpg

Examples Figure


First, the welding deformation

1: After welding member warpage.

2, analysis

(1) structural welds arranged uneven, asymmetry.

(2) steel member stiffness inconsistent, warpage after welding.

焊缝裂纹.jpg

Figure 2.1

Second, weld cracks

1, the phenomenon: local site produced welding weld seams.

2, analysis

(1) Preheat temperature is too low.

(2) welding material inappropriate choice or poor quality.

(3) improper welding process selection.

(4) rust, grease, water and other impurities are not cleaned on welding.

(5) base metal and filler metal containing C, S, P, Cu and other elements more.

(6) crater unfilled.

Third, not welded full (or crater)

1, phenomenon: the weld surface to form a continuous or discontinuous grooves.

2, analysis

(1) Welding level or transport speeds did not control.

Improper operation (2) or weld crater when arc welding interrupted again.

(3) automatic welding or semi-automatic welding, wire and power cut off.

气孔.jpg

Figure 3-1

Fourth, the stomata

1, phenomenon: the formation of the weld surface or internal cavities.

2, analysis

(1) electrodes, flux damp untreated.

(2) rust, grease, water and other impurities are not cleaned on welding.

(3) ignition or extinction positions overlap.

(4) the base material containing S or P elements and more.

(5) when the welding current, arc length or welding speed.

Fifth, undercut

1, phenomenon: the edge of the base metal weld is melted into depressions or grooves.

2, analysis

(1) The current is too large, the arc welding speed is too long or too fast.

(2) welding rod, wire angle fill properly.

(3) submerged arc voltage is too low.

Sixth, lack of fusion

1, phenomenon: lack of fusion between the weld filler metal and base metal or between.

2, analysis

(1) when the welding current is too small, too fast.

(2) improper welding groove shape, improper electrode diameter.

(3) Article angle welding operation is incorrect,

(4) lack of heat welding area.

(5) metal surface rust debris, not cleaned on welding.

Seven fillet height discrepancies

1. Symptom: welding foot height too high or lacking.

2, analysis

(1) improper selection of the welding electrode diameter.

(2) Welding hierarchy did not control.

Improper (3) welding speed.

Eight, weld high

1, phenomenon: the seam weld surface protrusion height is too high.

2, analysis

(1) the welding current is too small.

(2) welding speed is too slow.

(3) did not control the welding level.

(4) submerged arc point did not control.

Nine, incomplete penetration

1, phenomenon

Weld toe or layer between the base metal melting unutilized or fill up the molten metal.

2, analysis

(1) The welding current is too small, the welding speed is too fast.

(2) Welding unprocessed root properly.

(3) beveling angle is too small, too large blunt edge.

(4) assembly gap is too small.

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