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Welding Points And Precautions Of Stainless Steel
Jan 24, 2018

Welding Points and Precautions of Stainless Steel

First, the preparatory work before welding

1, according to product drawings require the use of mechanical processing methods in the joints, to remove the stainless steel composite layer, butt weld to be open the appropriate groove.

2, 10-20mm width on both sides of the weld within the width of the clean-up work done with wire brush or grinding method to remove oxides, rust, oil, moisture and other substances affect the quality of welding.

3, according to the product drawings assembly, in the carbon steel side with CJ422, φ3.2mm electrode positioning welding, positioning welders should have a valid post operation certificate to ensure the quality of positioning welding, positioning welding effective length of 25-30mm.

Second, the welding process

1, stainless steel composite plate on the seam welding process

1.1 basic carbon steel welding

1.1.1 The use of submerged arc welding method, welding a layer of positive, after turning over the first use of carbon arc gouging method to clear the root, and then seal the bottom layer. Welding specifications are as follows:

Position welding wire flux wire diameter arc voltage welding current welding speed

Front H08A J431 φ5mm 31-33V 500-550A 44-46 cm / min

Back side H08A J431 φ5 mm 32-34 V 580-620A 44-46 cm / min

1.1.2 after welding residue, and grinding.

1.1.3 X-ray inspection after welding, the sampling ratio of 10-20%, or UT detection test

1.2 over-layer welding

Using CO2 semi-automatic gas welding method, welding layer, welding specifications are as follows:

Flux cored wire TS-309 (Tiantai)

Wire diameter φ1.2 (MM)

The arc voltage is 19-21V

Welding current 130-150A

1.3 multi-layer welding

Using CO2 semi-automatic gas welding method, welding layer, welding specifications are as follows:

Flux cored wire TS-316L (Tiantai)

Wire diameter φ1.2 (MM)

Interlayer temperature 150. C


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