CN104972207A - Steel welding process - Google Patents

Abstract

The invention discloses a steel welding process. Involved welding parent metals are respectively Q235 steel and a kind of molybdenum-containing steel. The steel welding process comprises the following steps: 1) welding material: selecting a welding wire; 2) groove machining: adopting a mechanical method to cause a groove type to be a T type; 3) weld preheating: causing the preheating temperature to be not lower than 12 DEG C and causing the environment temperature to be not smaller than 0 DEG C; 4) bottom argon arc welding: introducing protective gas argon to a weld pool and leading back protective gas argon; and 5) argon arc welding covering: introducing protective gas argon to the weld pool. The steel welding process has the advantages that the welding bottom with bottom argon arc welding and argon arc welding covering is adopted, the pollution to the parent metals caused by the welding material in the welding process is effectively avoided; small thermal input is selected as far as possible during welding, a small welding current and a quick welding speed are adopted on the premise of guaranteeing welding quality, so that the corrosion resistance of the parent metals is not affected, and the mechanical properties of the parent metals are not changed.

Description

A kind of welded steel technique

Technical field

The present invention relates to welding technique field, is more particularly a kind of welded steel technique.

Background technology

In existing solder technology, in Practical Project is built, especially in the Industrial Steel structural facilities such as petrochemical industry, heavy manufactures, occasional runs into the welding between different types of steel, particularly as described in contain welding between molybdenum steel material with Q235 steel.Described containing molybdenum steel material and Q235 steel microstructure and Material property differences larger, welding performance is not good on the one hand usually to adopt conventional welding procedure, can cause on the other hand 2205 steel or the described welding base metal containing molybdenum steel material contaminated, not only affect the corrosion resistance of mother metal, and the mechanical property of mother metal can be changed, make the steel construction facility of construction there is unpredictable risk on the whole.

Summary of the invention

Technical scheme of the present invention is achieved in that a kind of welded steel technique, the welding base metal related to is respectively Q235 steel with a kind of containing molybdenum steel material, the described element containing molybdenum steel material is configured to (mass percent): C≤0.02%, Si≤1.30%, Mn≤1.80%, P≤0.0305%, S≤0.01%, Ni: 12.0 ~ 15.0%, Cr: 16.0 ~ 18.0%, Mo: 2.0 ~ 3.0%, surplus Fe; Comprise the following steps:

1) welding material: select welding wire;

2) retaining wall on slope: adopt mechanical means, slope type is T type;

3) weld preheating: preheat temperature should be more than or equal to 12 DEG C, environment temperature should be more than or equal to 0 DEG C;

4) bottom argon arc welding: molten bath leads to protective gas argon gas, and logical back of the body protective gas argon gas;

5) argon arc welding capping: electric current is 140 ~ 160 amperes, voltage is 25 ~ 30 volts, and speed of welding is 200 ~ 240 mm/min, and molten bath leads to protective gas argon gas, and flow is 15 ~ 20 liters/min.

Preferably, in described step 4), step 5) interlayer temperature should be controlled in welding process and be less than or equal to 80 DEG C.

Beneficial effect of the present invention: the welding procedure adopting bottom argon arc welding and argon arc welding capping, to efficiently avoid in welding process welding material to the pollution of mother metal; And select little heat input when welding, in guarantee as far as possible

Adopt little welding current and speed of welding faster under the prerequisite of welding quality, thus do not affect the corrosion resistance of mother metal, the mechanical property of mother metal can not be changed.

Detailed description of the invention

Embodiment provided by the invention is described in further detail:

A kind of welded steel technique, the welding base metal related to is respectively Q235 steel with a kind of containing molybdenum steel material, the described element containing molybdenum steel material is configured to (mass percent): C≤0.02%, Si≤1.30%, Mn≤1.80%, P≤0.0305%, S≤0.01%, Ni: 12.0 ~ 15.0%, Cr: 16.0 ~ 18.0%, Mo: 2.0 ~ 3.0%, surplus Fe; Comprise the following steps:

1) welding material: select welding wire;

2) retaining wall on slope: adopt mechanical means, slope type is T type;

3) weld preheating: preheat temperature should be more than or equal to 12 DEG C, environment temperature should be more than or equal to 0 DEG C;

4) bottom argon arc welding: molten bath leads to protective gas argon gas, and logical back of the body protective gas argon gas;

5) argon arc welding capping: electric current is 140 ~ 160 amperes, voltage is 25 ~ 30 volts, and speed of welding is 200 ~ 240 mm/min, and molten bath leads to protective gas argon gas, and flow is 15 ~ 20 liters/min.

Preferably, in described step 4), step 5) interlayer temperature should be controlled in welding process and be less than or equal to 80 DEG C.

Beneficial effect of the present invention: the welding procedure adopting bottom argon arc welding and argon arc welding capping, to efficiently avoid in welding process welding material to the pollution of mother metal; And select little heat input when welding, in guarantee as far as possible

Adopt little welding current and speed of welding faster under the prerequisite of welding quality, thus do not affect the corrosion resistance of mother metal, the mechanical property of mother metal can not be changed.

In this description, the present invention is described with reference to its specific embodiment.But, still can make various amendment and conversion obviously and not deviate from the spirit and scope of the present invention.Therefore, description is regarded in an illustrative, rather than a restrictive.

Claims (2)

1. a welded steel technique, the welding base metal related to is respectively Q235 steel with a kind of containing molybdenum steel material, the described element containing molybdenum steel material is configured to (mass percent): C≤0.02%, Si≤1.30%, Mn≤1.80%, P≤0.0305%, S≤0.01%, Ni: 12.0 ~ 15.0%, Cr: 16.0 ~ 18.0%, Mo: 2.0 ~ 3.0%, surplus Fe; It is characterized in that, comprise the following steps:

1) welding material: select welding wire;

2) retaining wall on slope: adopt mechanical means, slope type is T type;

3) weld preheating: preheat temperature should be more than or equal to 12 DEG C, environment temperature should be more than or equal to 0 DEG C;

4) bottom argon arc welding: molten bath leads to protective gas argon gas, and logical back of the body protective gas argon gas;

5) argon arc welding capping: electric current is 140 ~ 160 amperes, voltage is 25 ~ 30 volts, and speed of welding is 200 ~ 240 mm/min, and molten bath leads to protective gas argon gas, and flow is 15 ~ 20 liters/min.

2., according to a kind of welded steel technique described in claim 1, it is characterized in that, in described step 4), step 5) interlayer temperature should be controlled in welding process and be less than or equal to 80 DEG C.