Straight swing welding, the narrower plastic deformation zone formed by welding start

appear only once, but due to the continuous weaving welding, heat input capacity,

stainless steel bathroom grab bar  heated area, large plastic deformation area is caused by

compression, thus shrinkage after welding is Great.

 

 For this, the main deformation transverse contraction, the rectangular

cross-section dimensions are affected, each side is indented space reserved about 90

percent; after the transverse weld shrinkage riser ends bent inward, so that drum-shaped

member is formed ; As the weld large cross section, enter more calories, it would

inevitably lead to greater longitudinal shrinkage, so that the deflection member is formed

in the longitudinal direction; for the distortion caused by welding deformation caused by

the irrational, the correction is very difficult, and sometimes have to cut re-welding or

scrap the whole. STAGED jump when welding, each layer very small cross-section, the

required heat is small, and each layer is divided into several segments stitch welding,

soldering each section are basically re-establishment of a temperature field on a cold

steel every time the emergence of a narrow zone of plastic deformation, and thus the

average width (ie transverse shrinkage of size) plastic deformation than the corresponding

small weld layered straight, longitudinal shrinkage is small, compared to once-through

continuous fill swing welding deformation even smaller.

 

Seamless steel pipe corrosion and

cracking of austenitic welded joints is relatively serious, no plastic deformation of

brittle fracture is its performance, we only reasonable molding and assembly processes, is

preventable. 35min furnace heating time or time? Furnace time is generally more than

60min. When the assembly must be "wary" it, to avoid its "body" to scratch. There are

major deformation deflection (positive curvature), scoliosis, angular distortion and

twisting deformation of welding.

 

The following principles should be welded order to reduce

distortion, small-diameter seamless steel pipe butt welding sequence: taken from the

middle to both sides of the symmetry STAGED skip welding, welding straight welding

deformation generated less than conducive to disperse and release stress , to avoid stress

in complex weldment. Cause seamless cracks, the test proved that the tube (round) reasons

mostly contain more internal cracks, inclusions, gas bags.

Control of welding deformation

of small diameter seamless steel pipe, because of its shape elongated rod class belong,

therefore extremely difficult to control the welding deformation. Perforation heating

temperature 1180 ~ 1230 , low carbon steel which is the temperature, take 1230-1250, it

is appropriate.

 

Seamless finish annealing temperature is appropriate. Perforated

temperature, process adjustments can not be ignored, if the temperature is low

perforation, adjusted properly, will cause tearing capillary internal organization.. When

the concentration of the electrolyte is saturated or over-saturated state, the smaller

volume of metal hydroxide or some kind of salt will be deposited on the surface of the

metal layer of insoluble membrane characteristics of this film is very loose, although not

It can directly lead to a passivation of metals, but can hinder dissolve the metal,

because the electrode surface is covered

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