D812 鈷基2號堆焊焊條
鈷基堆焊焊條的焊芯為鈷鉻鎢即司太立合金,鈦鈣型藥皮。此類合金具有良好的紅硬性,在600℃以上仍能保持較高的硬度及良好的耐磨、耐蝕性。其中,碳高、耐磨性好,而抗沖擊能力下降。堆焊焊條的堆焊效果一般與工件的預(yù)熱及層間溫度高低、焊接電流大小、電弧長短以及堆焊焊層的層數(shù)等有關(guān)。如堆焊層的化學(xué)成分、硬度等通常是指堆焊三層以上的堆焊金屬而言。
所屬分類: 鈷基堆焊焊條
產(chǎn)品詳情
標(biāo)準(zhǔn):
符合GB EDCoCr-B-03
相當(dāng)AWS ECoCr-B
說明:
D812是鈦鈣型藥皮,中碳的鈷鉻鎢合金為焊芯的堆焊焊條。可交直流兩用,電弧穩(wěn)定,渣復(fù)蓋性好,成型美觀。堆焊層具有良好的耐蝕及耐磨性能,在600℃以上的高溫中也能保持這種特性。D812在鈷鉻鎢堆焊合金中具有中等硬度,耐磨性較D802好,但塑性較D802稍差。用硬質(zhì)合金刀具可進(jìn)行切削加工。金相組織為奧氏體和共晶體。
D812 is a titanium-calcium type coating, a medium-carbon cobalt-chromium-tungsten alloy surfacing electrode with a core. It can be used for both AC and DC, stable arc, good slag coverage, and beautiful shape. The surfacing layer has good corrosion resistance and wear resistance, and can maintain this characteristic even at high temperatures above 600°C. D812 has medium hardness among cobalt-chromium-tungsten surfacing alloys, and its wear resistance is better than D802, but its plasticity is slightly worse than D802. Carbide cutting tools can be used for cutting. The metallographic structure is austenite and eutectic.
用途:
用于高溫高壓閥門,內(nèi)燃機閥、化纖剪切刀刃口、高壓泵的軸套筒和內(nèi)襯套筒、熱軋型孔等堆焊。
Used for surfacing welding of high temperature and high pressure valves, internal combustion engine valves, chemical fiber shear blades, shaft sleeves and lining sleeves of high pressure pumps, and hot rolled holes.
熔敷金屬化學(xué)成分(%)
C | Mn | Si | Cr | W | Co | Fe | 其他元素總量 |
1.0~1.70 | ≤2.0 | ≤2.0 | 25.0~32.0 | 7.0~10.0 | 余量 | ≤5.0 | ≤4.0 |
堆焊層常溫硬度值
HRc=45~50
以上化學(xué)成分及常溫硬度指堆焊三層以上堆焊金屬。
The above chemical composition and normal temperature hardness refer to the surfacing welding of more than three layers of surfacing metal.
參考電流:AC或DC
焊條直徑(mm) | 3.2 | 4.0 | 5.0 |
焊接電流(A) | 90~130 | 140~170 | 170~200 |
注意事項:
1. 焊前焊條須經(jīng)150℃烘焙一小時。
2. 為了避免產(chǎn)生裂縫,根據(jù)工件大小和母材種類,須經(jīng)過200~400℃的預(yù)熱。并宜采用小電流短弧焊接。焊后應(yīng)將工件立即放入干燥和預(yù)熱的砂缸或草灰中緩冷。
3. 由于電弧焊的溫度較氣焊高,故稀釋率也較氣焊大,因此一般只在難于進(jìn)行氣焊或為提高焊接效率時才考慮電弧焊。
1. The electrode must be baked at 150℃ for one hour before welding.
2. In order to avoid cracks, according to the size of the workpiece and the type of base material, it must be preheated at 200~400℃. And it is advisable to use small current short arc welding. After welding, the workpiece should be placed in a dry and preheated sand jar or straw ash to cool slowly.
3. Since the temperature of arc welding is higher than that of gas welding, the dilution rate is also greater than that of gas welding. Therefore, arc welding is generally only considered when it is difficult to perform gas welding or to improve welding efficiency.
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銅及銅合金焊絲常用于焊接銅及銅合金,其中黃銅焊絲也廣泛用于釬焊碳鋼、鑄鐵及硬質(zhì)合金刀具等。選用適當(dāng)?shù)暮附z進(jìn)行氬弧焊是保證銅及青銅焊接質(zhì)量的有效方法之一,不但可獲得性能良好的焊縫而且有利于減少焊件變形。用氧-乙炔氣焊時應(yīng)配合銅氣焊熔劑使用,或使用已包有銅氣焊熔劑的銅焊絲。碳弧焊也是焊接銅及銅合金的常用方法之一,碳弧焊的焊接工藝和氣焊類似,焊絲及熔劑也和氣焊時一樣。
銅及銅合金焊絲常用于焊接銅及銅合金,其中黃銅焊絲也廣泛用于釬焊碳鋼、鑄鐵及硬質(zhì)合金刀具等。選用適當(dāng)?shù)暮附z進(jìn)行氬弧焊是保證銅及青銅焊接質(zhì)量的有效方法之一,不但可獲得性能良好的焊縫而且有利于減少焊件變形。用氧-乙炔氣焊時應(yīng)配合銅氣焊熔劑使用,或使用已包有銅氣焊熔劑的銅焊絲。碳弧焊也是焊接銅及銅合金的常用方法之一,碳弧焊的焊接工藝和氣焊類似,焊絲及熔劑也和氣焊時一樣。
銅及銅合金焊絲常用于焊接銅及銅合金,其中黃銅焊絲也廣泛用于釬焊碳鋼、鑄鐵及硬質(zhì)合金刀具等。選用適當(dāng)?shù)暮附z進(jìn)行氬弧焊是保證銅及青銅焊接質(zhì)量的有效方法之一,不但可獲得性能良好的焊縫而且有利于減少焊件變形。用氧-乙炔氣焊時應(yīng)配合銅氣焊熔劑使用,或使用已包有銅氣焊熔劑的銅焊絲。碳弧焊也是焊接銅及銅合金的常用方法之一,碳弧焊的焊接工藝和氣焊類似,焊絲及熔劑也和氣焊時一樣。