Non-preheating and non-copper-plating automatic low-alloy-steel welding wire for ships and production technology of wire

Abstract

The invention relates to a non-preheating and non-copper-plating automatic low-alloy-steel welding wire for ships. The welding wire comprises the following chemical compositions: 0.02%-0.1% of C, 2%-4% of Mn, 2%-4% of Ni, 0.5%-1% of Mo, 0.5%-0.8% of Si, 0-0.5% of Cu, 0-1.2% of Cr, 0-0.12% of V and 0-0.05% of Ti; and the drawing diameter of the welding wire ranges from phi 4.0mm to phi 1.0mm. The non-preheating and non-copper-plating automatic low-alloy-steel welding wire can be used for welding steel with high strength and high toughness without preheating, can avoid cold cracks during welding of a modern ship structure, can simplify a production technology, reduce the production cost and improve the production efficiency during the welding process, and can reduce the production cost and prevent impurities containing copper from being mixed to influence a welding effect since the welding wire does not need to be stored in a copper plating way.

Description

technical field

[0001] The invention relates to the field of automatic welding wire preparation, in particular to a low-alloy steel automatic welding wire for ships without preheating and copper plating and a production process thereof. Background technique

[0002] Low-alloy high-strength steel has good weldability, excellent formability and low manufacturing cost, so it is widely used in pressure vessels, vehicles, bridges, construction, engineering machinery, mining machinery, textile machinery, marine structures, ships, Power, petrochemical, military products and aerospace and other fields. With the increase of alloy element content, strength level and restraint degree of welding structure of steel, its hardening tendency increases obviously, and welding cold crack has become one of the main problems faced by low-alloy high-strength steel welding.

[0003] Preheating before welding and heat treatment after welding are usually used in production to avoid welding cracks, ...

Examples

Embodiment 1

[0020] The low-alloy steel automatic welding wire for ships without preheating and copper plating in this embodiment includes: C 0.02%, Mn 2%, Ni 4%, Mo 0.5%, Si 0.5%, Cu 0.2%, Cr 0.5 %, V 0.1%, Ti 0.01%; the wire diameter is drawn from Ф4.0mm to Ф1.0mm.

Embodiment 2

[0022] The low-alloy steel automatic welding wire for ships without preheating and copper plating in this embodiment includes: C 0.05%, Mn 3%, Ni 3%, Mo 0.7%, Si 0.6%, Cu 0.3%, Cr 0.6 %, V 0.06%, Ti 0.03%; the wire diameter is drawn from Ф4.0mm to Ф1.0mm

Embodiment 3

[0024] The low-alloy steel automatic welding wire for ships without preheating and copper plating in this embodiment includes: C 0.1%, Mn 4%, Ni 2%, Mo 1%, Si 0.8%, Cu 0.5%, Cr 1.2 %, V 0.12%, Ti 0.05%; the wire diameter is drawn from Ф4.0mm to Ф1.0mm.

technical field

[0001] The invention relates to the field of automatic welding wire preparation, in particular to a low-alloy steel automatic welding wire for ships without preheating and copper plating and a production process thereof. Background technique

[0002] Low-alloy high-strength steel has good weldability, excellent formability and low manufacturing cost, so it is widely used in pressure vessels, vehicles, bridges, construction, engineering machinery, mining machinery, textile machinery, marine structures, ships, Power, petrochemical, military products and aerospace and other fields. With the increase of alloy element content, strength level and restraint degree of welding structure of steel, its hardening tendency increases obviously, and welding cold crack has become one of the main problems faced by low-alloy high-strength steel welding.

[0003] Preheating before welding and heat treatment after welding are usually used in production to avoid welding cracks, ...

Examples

Embodiment 1

[0020] The low-alloy steel automatic welding wire for ships without preheating and copper plating in this embodiment includes: C 0.02%, Mn 2%, Ni 4%, Mo 0.5%, Si 0.5%, Cu 0.2%, Cr 0.5 %, V 0.1%, Ti 0.01%; the wire diameter is drawn from Ф4.0mm to Ф1.0mm.

Embodiment 2

[0022] The low-alloy steel automatic welding wire for ships without preheating and copper plating in this embodiment includes: C 0.05%, Mn 3%, Ni 3%, Mo 0.7%, Si 0.6%, Cu 0.3%, Cr 0.6 %, V 0.06%, Ti 0.03%; the wire diameter is drawn from Ф4.0mm to Ф1.0mm

Embodiment 3

[0024] The low-alloy steel automatic welding wire for ships without preheating and copper plating in this embodiment includes: C 0.1%, Mn 4%, Ni 2%, Mo 1%, Si 0.8%, Cu 0.5%, Cr 1.2 %, V 0.12%, Ti 0.05%; the wire diameter is drawn from Ф4.0mm to Ф1.0mm.

Images